chore(dependencies): Bump extract-text-webpack-plugin from 3.0.0 to 3.0.2 (#28)

Bumps [extract-text-webpack-plugin](https://github.com/webpack-contrib/extract-text-webpack-plugin) from 3.0.0 to 3.0.2.
- [Release notes](https://github.com/webpack-contrib/extract-text-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/extract-text-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/extract-text-webpack-plugin/compare/v3.0.0...v3.0.2)

yarn.lock

@@ -2605,7 +2605,7 @@ extglob@^0.3.1:
   dependencies:
     is-extglob "^1.0.0"
 
-extract-text-webpack-plugin@^3.0.0, extract-text-webpack-plugin@~3.0:
+extract-text-webpack-plugin@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/extract-text-webpack-plugin/-/extract-text-webpack-plugin-3.0.0.tgz#90caa7907bc449f335005e3ac7532b41b00de612"
   dependencies:
@@ -2614,6 +2614,15 @@ extract-text-webpack-plugin@^3.0.0, extract-text-webpack-plugin@~3.0:
     schema-utils "^0.3.0"
     webpack-sources "^1.0.1"
 
+extract-text-webpack-plugin@~3.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extract-text-webpack-plugin/-/extract-text-webpack-plugin-3.0.2.tgz#5f043eaa02f9750a9258b78c0a6e0dc1408fb2f7"
+  dependencies:
+    async "^2.4.1"
+    loader-utils "^1.1.0"
+    schema-utils "^0.3.0"
+    webpack-sources "^1.0.1"
+
 extsprintf@1.3.0, extsprintf@^1.2.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/extsprintf/-/extsprintf-1.3.0.tgz#96918440e3041a7a414f8c52e3c574eb3c3e1e05"