chore(dependencies): Bump aetna from 0.1.0 to 0.2.0

Bumps [aetna](https://github.com/pressbooks/aetna) from 0.1.0 to 0.2.0.
- [Release notes](https://github.com/pressbooks/aetna/releases/tag/0.2.0)
- [Commits](https://github.com/pressbooks/aetna/compare/0.1.0...0.2.0)

package.json

@@ -53,7 +53,7 @@
 		"pressbooks-build-tools": "^0.9.0"
 	},
 	"dependencies": {
-		"aetna": "^0.1.0",
+		"aetna": "^0.2.0",
 		"isotope-layout": "^3.0.4",
 		"jquery": "1.12.4 - 3",
 		"jquery-bridget": "^2.0.1",

yarn.lock

@@ -113,9 +113,9 @@ adjust-sourcemap-loader@^1.1.0:
     object-path "^0.9.2"
     regex-parser "^2.2.1"
 
-aetna@^0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/aetna/-/aetna-0.1.0.tgz#571bb3985f624581c550e875a598b410feeb33d2"
+aetna@^0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/aetna/-/aetna-0.2.0.tgz#d927f2ed9db96754343d8b1eec4f0762aa1a2e85"
 
 after@0.8.1:
   version "0.8.1"