Bump aetna from 1.0.0-alpha.20 to 1.0.0-alpha.21

Bumps [aetna](https://github.com/pressbooks/aetna) from 1.0.0-alpha.20 to 1.0.0-alpha.21.
- [Release notes](https://github.com/pressbooks/aetna/releases)
- [Commits](https://github.com/pressbooks/aetna/commits)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package-lock.json

@@ -332,9 +332,9 @@
       }
     },
     "aetna": {
-      "version": "1.0.0-alpha.20",
-      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.20.tgz",
-      "integrity": "sha512-/yISB6n+yIjJdaGX0phc+G4KMTg8NP9hMHIMyYRh+/+DsO9sgoG/ip7wQnZy35v1d2/WtRWALos0OWkhl8nMuQ==",
+      "version": "1.0.0-alpha.21",
+      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.21.tgz",
+      "integrity": "sha512-tY1E96MMjIhR+zyMjXi8s79yyrkSYTk8RpV1l5lqDWR220OQ2LVwz6MqImjmScy53C3PkBJbyYmLy4pVE5jSdw==",
       "requires": {
         "@frctl/fractal": "^1.1.7"
       }
@@ -2203,8 +2203,7 @@
             },
             "ansi-regex": {
               "version": "2.1.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "aproba": {
               "version": "1.2.0",
@@ -2569,8 +2568,7 @@
             },
             "safe-buffer": {
               "version": "5.1.1",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "safer-buffer": {
               "version": "2.1.2",
@@ -2618,7 +2616,6 @@
             "strip-ansi": {
               "version": "3.0.1",
               "bundled": true,
-              "optional": true,
               "requires": {
                 "ansi-regex": "^2.0.0"
               }
@@ -2657,13 +2654,11 @@
             },
             "wrappy": {
               "version": "1.0.2",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             },
             "yallist": {
               "version": "3.0.2",
-              "bundled": true,
-              "optional": true
+              "bundled": true
             }
           }
         },
@@ -2780,9 +2775,9 @@
           "integrity": "sha512-cQKh8igo5QUhZ7lg38DYWAxMvjSAKG0A8wGSVimP07SIUEK2UO+arSRKbRZWtelMtN5V0Hkwh5ryOto/SshYIg=="
         },
         "nan": {
-          "version": "2.11.1",
-          "resolved": "https://registry.npmjs.org/nan/-/nan-2.11.1.tgz",
-          "integrity": "sha512-iji6k87OSXa0CcrLl9z+ZiYSuR2o+c0bGuNmXdrhTQTakxytAFsC56SArGYoiHlJlFoHSnvmhpceZJaXkVuOtA==",
+          "version": "2.12.0",
+          "resolved": "https://registry.npmjs.org/nan/-/nan-2.12.0.tgz",
+          "integrity": "sha512-zT5nC0JhbljmyEf+Z456nvm7iO7XgRV2hYxoBtPpnyp+0Q4aCoP6uWNn76v/I6k2kCYNLWqWbwBWQcjsNI/bjw==",
           "optional": true
         },
         "opn": {
@@ -7390,7 +7385,8 @@
         },
         "balanced-match": {
           "version": "0.4.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "bcrypt-pbkdf": {
           "version": "1.0.1",
@@ -7419,6 +7415,7 @@
         "brace-expansion": {
           "version": "1.1.7",
           "bundled": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^0.4.1",
             "concat-map": "0.0.1"
@@ -7454,7 +7451,8 @@
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
@@ -7552,7 +7550,8 @@
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "fstream": {
           "version": "1.0.11",
@@ -7608,6 +7607,7 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "^1.0.0",
             "inflight": "^1.0.4",
@@ -7654,7 +7654,8 @@
         },
         "hoek": {
           "version": "2.16.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "http-signature": {
           "version": "1.1.1",
@@ -7669,6 +7670,7 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "once": "^1.3.0",
             "wrappy": "1"
@@ -7676,7 +7678,8 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.4",
@@ -7776,6 +7779,7 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -7854,6 +7858,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -7879,7 +7884,8 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "performance-now": {
           "version": "0.2.0",
@@ -7965,6 +7971,7 @@
         "rimraf": {
           "version": "2.6.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "glob": "^7.0.5"
           }

package.json

@@ -62,7 +62,7 @@
 		"pressbooks-build-tools": "^0.13.0"
 	},
 	"dependencies": {
-		"aetna": "^1.0.0-alpha.20",
+		"aetna": "^1.0.0-alpha.21",
 		"isotope-layout": "^3.0.6",
 		"jquery-bridget": "^2.0.1",
 		"js-cookie": "^2.2.0",