fix: update fs-extra to version ^7.0.0 (#1003)

Author: renovate[bot]

package.json

@@ -35,7 +35,7 @@
     "clean-css": "^4.1.11",
     "commander": "^2.12.0",
     "cpx": "^1.5.0",
-    "fs-extra": "^6.0.0",
+    "fs-extra": "^7.0.0",
     "glob": "^7.1.2",
     "injection-js": "^2.2.1",
     "less": "^3.0.0",

yarn.lock

@@ -1725,9 +1725,9 @@ fs-extra@^4.0.2:
     jsonfile "^4.0.0"
     universalify "^0.1.0"
 
-fs-extra@^6.0.0:
-  version "6.0.0"
-  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-6.0.0.tgz#0f0afb290bb3deb87978da816fcd3c7797f3a817"
+fs-extra@^7.0.0:
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.0.tgz#8cc3f47ce07ef7b3593a11b9fb245f7e34c041d6"
   dependencies:
     graceful-fs "^4.1.2"
     jsonfile "^4.0.0"