chore: remove cross-env dep

Author: kt3k

package.json

@@ -30,7 +30,6 @@
   },
   "dependencies": {
     "bulbo": "^6.13.0",
-    "cross-env": "^3.1.3",
     "gulp-front-matter": "^1.3.0",
     "gulp-marked": "^1.0.0",
     "gulp-nunjucks": "^2.3.0",

yarn.lock

@@ -185,9 +185,9 @@ builtin-modules@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/builtin-modules/-/builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
 
-bulbo@^6.9.0:
-  version "6.9.0"
-  resolved "https://registry.yarnpkg.com/bulbo/-/bulbo-6.9.0.tgz#d268402f6f97e3813a8c2d8f99ad489fd5b2a2d3"
+bulbo@^6.13.0:
+  version "6.13.0"
+  resolved "https://registry.yarnpkg.com/bulbo/-/bulbo-6.13.0.tgz#48773521a42af4e22baba96f61b5ec405375810d"
   dependencies:
     chalk "^1.1.1"
     chokidar "^1.4.2"
@@ -198,7 +198,7 @@ bulbo@^6.9.0:
     minirocket "^2.0.0"
     stream-splicer "^2.0.0"
     vinyl-fs "^2.2.1"
-    vinyl-serve "^2.7.0"
+    vinyl-serve "^2.8.0"
 
 callsite@^1.0.0:
   version "1.0.0"
@@ -332,19 +332,6 @@ core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-cross-env:
-  version "3.1.3"
-  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-3.1.3.tgz#58cd8231808f50089708b091f7dd37275a8e8154"
-  dependencies:
-    cross-spawn "^3.0.1"
-
-cross-spawn@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-3.0.1.tgz#1256037ecb9f0c5f79e3d6ef135e30770184b982"
-  dependencies:
-    lru-cache "^4.0.1"
-    which "^1.2.9"
-
 cryptiles@2.x.x:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/cryptiles/-/cryptiles-2.0.5.tgz#3bdfecdc608147c1c67202fa291e7dca59eaa3b8"
@@ -1407,13 +1394,6 @@ loud-rejection@^1.0.0:
     currently-unhandled "^0.4.1"
     signal-exit "^3.0.0"
 
-lru-cache@^4.0.1:
-  version "4.0.1"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.0.1.tgz#1343955edaf2e37d9b9e7ee7241e27c4b9fb72be"
-  dependencies:
-    pseudomap "^1.0.1"
-    yallist "^2.0.0"
-
 map-cache@^0.2.0:
   version "0.2.2"
   resolved "https://registry.yarnpkg.com/map-cache/-/map-cache-0.2.2.tgz#c32abd0bd6525d9b051645bb4f26ac5dc98a0dbf"
@@ -1754,10 +1734,6 @@ process-nextick-args@^1.0.6, process-nextick-args@~1.0.6:
   version "1.0.7"
   resolved "https://registry.yarnpkg.com/process-nextick-args/-/process-nextick-args-1.0.7.tgz#150e20b756590ad3f91093f25a4f2ad8bff30ba3"
 
-pseudomap@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
-
 qs@~6.2.0:
   version "6.2.1"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.2.1.tgz#ce03c5ff0935bc1d9d69a9f14cbd18e568d67625"
@@ -2213,9 +2189,9 @@ vinyl-fs@^2.2.1, vinyl-fs@^2.4.4:
     vali-date "^1.0.0"
     vinyl "^1.0.0"
 
-vinyl-serve@^2.7.0:
-  version "2.7.0"
-  resolved "https://registry.yarnpkg.com/vinyl-serve/-/vinyl-serve-2.7.0.tgz#ae1fef3ffb32264a1ba738c0abf4219b850c367f"
+vinyl-serve@^2.8.0:
+  version "2.8.0"
+  resolved "https://registry.yarnpkg.com/vinyl-serve/-/vinyl-serve-2.8.0.tgz#c92af74dfccb43e1274d3786fcbe20c9354cda49"
   dependencies:
     es6-promise "^4.0.3"
     mime "^1.3.4"
@@ -2256,7 +2232,7 @@ vinyl@^2.0.0:
     remove-trailing-separator "^1.0.1"
     replace-ext "^1.0.0"
 
-which@^1.2.10, which@^1.2.9:
+which@^1.2.10:
   version "1.2.11"
   resolved "https://registry.yarnpkg.com/which/-/which-1.2.11.tgz#c8b2eeea6b8c1659fa7c1dd4fdaabe9533dc5e8b"
   dependencies:
@@ -2294,10 +2270,6 @@ y18n@^3.2.0:
   version "3.2.1"
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-3.2.1.tgz#6d15fba884c08679c0d77e88e7759e811e07fa41"
 
-yallist@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.0.0.tgz#306c543835f09ee1a4cb23b7bce9ab341c91cdd4"
-
 yargs@^3.32.0:
   version "3.32.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-3.32.0.tgz#03088e9ebf9e756b69751611d2a5ef591482c995"