Update dependency babel-loader to v8

Author: renovate-bot

package-lock.json

@@ -24,7 +24,7 @@
     "autoprefixer": "9.1.3",
     "babel-core": "6.26.3",
     "babel-eslint": "9.0.0",
-    "babel-loader": "7.1.5",
+    "babel-loader": "8.0.0",
     "babel-plugin-transform-class-properties": "6.24.1",
     "babel-plugin-transform-decorators-legacy": "1.3.5",
     "babel-plugin-transform-object-rest-spread": "6.26.0",

package.json

@@ -663,13 +663,14 @@ babel-helpers@^6.24.1:
     babel-runtime "^6.22.0"
     babel-template "^6.24.1"
 
-babel-loader@7.1.5:
-  version "7.1.5"
-  resolved "https://registry.yarnpkg.com/babel-loader/-/babel-loader-7.1.5.tgz#e3ee0cd7394aa557e013b02d3e492bfd07aa6d68"
+babel-loader@8.0.0:
+  version "8.0.0"
+  resolved "https://registry.yarnpkg.com/babel-loader/-/babel-loader-8.0.0.tgz#c42f2bef268d0d8bb4ceec5d02b540a9055d58a0"
   dependencies:
     find-cache-dir "^1.0.0"
     loader-utils "^1.0.2"
     mkdirp "^0.5.1"
+    util.promisify "^1.0.0"
 
 babel-messages@^6.23.0:
   version "6.23.0"
@@ -5962,7 +5963,7 @@ util-deprecate@~1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/util-deprecate/-/util-deprecate-1.0.2.tgz#450d4dc9fa70de732762fbd2d4a28981419a0ccf"
 
-util.promisify@1.0.0:
+util.promisify@1.0.0, util.promisify@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/util.promisify/-/util.promisify-1.0.0.tgz#440f7165a459c9a16dc145eb8e72f35687097030"
   dependencies: