build: Bump aetna from 1.0.0-alpha.6 to 1.0.0-alpha.7 (#80 An error occurred )

Bumps [aetna](https://github.com/pressbooks/aetna) from 1.0.0-alpha.6 to 1.0.0-alpha.7.
- [Release notes](https://github.com/pressbooks/aetna/releases/tag/1.0.0-alpha.7)
- [Commits](https://github.com/pressbooks/aetna/compare/1.0.0-alpha.6...1.0.0-alpha.7)

package-lock.json

@@ -284,9 +284,9 @@
       }
     },
     "aetna": {
-      "version": "1.0.0-alpha.6",
-      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.6.tgz",
-      "integrity": "sha512-y9dwb4g1bt5Ntv3hnjLQlsfMH3fz1nFgzlPLA0oHwJzz07Ug398vjctGe+myA2ApPkJhnvjy8sfry0F9hRZXTg==",
+      "version": "1.0.0-alpha.7",
+      "resolved": "https://registry.npmjs.org/aetna/-/aetna-1.0.0-alpha.7.tgz",
+      "integrity": "sha512-Y5g4ndWyX6c3GWR7YJT7Yn5p0SWNSEigRHXbKX6lUKaMe7K0HzL/A6MJm44iFa5mmuGS8uQFHFxdq0mLvHJWOg==",
       "requires": {
         "@frctl/fractal": "1.1.7"
       }

package.json

@@ -54,7 +54,7 @@
 		"pressbooks-build-tools": "^0.10.0"
 	},
 	"dependencies": {
-		"aetna": "^1.0.0-alpha.6",
+		"aetna": "^1.0.0-alpha.7",
 		"isotope-layout": "^3.0.5",
 		"jquery-bridget": "^2.0.1",
 		"js-cookie": "^2.2.0",

yarn.lock

@@ -178,9 +178,9 @@ adjust-sourcemap-loader@^1.1.0:
     object-path "^0.9.2"
     regex-parser "^2.2.1"
 
-aetna@^1.0.0-alpha.6:
-  version "1.0.0-alpha.6"
-  resolved "https://registry.yarnpkg.com/aetna/-/aetna-1.0.0-alpha.6.tgz#f5c1058cf9b3c1f5a697ab9439975df14555ff2f"
+aetna@^1.0.0-alpha.7:
+  version "1.0.0-alpha.7"
+  resolved "https://registry.yarnpkg.com/aetna/-/aetna-1.0.0-alpha.7.tgz#5f18cae26b417b439a7cd56cc44a46590c7cfa7c"
   dependencies:
     "@frctl/fractal" "^1.1.7"