Bump cross-spawn from 5.1.0 to 6.0.3

Bumps [cross-spawn](https://github.com/moxystudio/node-cross-spawn) from 5.1.0 to 6.0.3.
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@5.1.0...v6.0.3)

package.json

@@ -50,7 +50,7 @@
     "copy-webpack-plugin": "^4.3.1",
     "coveralls": "^3.0.0",
     "cross-env": "^5.1.1",
-    "cross-spawn": "^5.0.1",
+    "cross-spawn": "^6.0.3",
     "css-loader": "^0.28.8",
     "eslint": "^3.14.1",
     "eslint-config-standard": "^6.2.1",

yarn.lock

@@ -1705,6 +1705,16 @@ cross-spawn@^5.0.1, cross-spawn@^5.1.0:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
+cross-spawn@^6.0.3:
+  version "6.0.3"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.3.tgz#7cbe31768ba0f1cc37acc925bf09e7a9a4a9b0ab"
+  dependencies:
+    nice-try "^1.0.4"
+    path-key "^2.0.1"
+    semver "^5.5.0"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
 cryptiles@2.x.x:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/cryptiles/-/cryptiles-2.0.5.tgz#3bdfecdc608147c1c67202fa291e7dca59eaa3b8"
@@ -4442,6 +4452,10 @@ netmask@~1.0.4:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/netmask/-/netmask-1.0.6.tgz#20297e89d86f6f6400f250d9f4f6b4c1945fcd35"
 
+nice-try@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.4.tgz#d93962f6c52f2c1558c0fbda6d512819f1efe1c4"
+
 nightwatch@^0.9.19:
   version "0.9.19"
   resolved "https://registry.yarnpkg.com/nightwatch/-/nightwatch-0.9.19.tgz#4bd9757273d30b845f04847a98b71be9bb7c4b3b"
@@ -4886,7 +4900,7 @@ path-is-inside@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/path-is-inside/-/path-is-inside-1.0.2.tgz#365417dede44430d1c11af61027facf074bdfc53"
 
-path-key@^2.0.0:
+path-key@^2.0.0, path-key@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
 
@@ -5895,6 +5909,10 @@ selenium-server@^3.8.1:
   version "5.4.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.4.1.tgz#e059c09d8571f0540823733433505d3a2f00b18e"
 
+semver@^5.5.0:
+  version "5.5.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
+
 semver@~4.3.3:
   version "4.3.6"
   resolved "https://registry.yarnpkg.com/semver/-/semver-4.3.6.tgz#300bc6e0e86374f7ba61068b5b1ecd57fc6532da"