chore(package): update expose-loader to version 0.7.3

Closes #454

https://greenkeeper.io/

package.json

@@ -29,7 +29,7 @@
     "copy-webpack-plugin": "4.0.1",
     "eslint": "3.15.0",
     "eslint-config-scratch": "^3.1.0",
-    "expose-loader": "0.7.1",
+    "expose-loader": "0.7.3",
     "gh-pages": "0.12.0",
     "highlightjs": "9.8.0",
     "htmlparser2": "3.9.2",