fix: update dependency cosmiconfig to ^4.0.0 (#234)

@commitlint/core/package.json

@@ -81,7 +81,7 @@
     "@marionebl/sander": "^0.6.0",
     "babel-runtime": "^6.23.0",
     "chalk": "^2.0.1",
-    "cosmiconfig": "^3.0.1",
+    "cosmiconfig": "^4.0.0",
     "git-raw-commits": "^1.3.0",
     "lodash.merge": "4.6.0",
     "lodash.mergewith": "4.6.0",

yarn.lock

@@ -1958,7 +1958,7 @@ [email protected], core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-cosmiconfig@^3.0.1, cosmiconfig@^3.1.0:
+cosmiconfig@^3.1.0:
   version "3.1.0"
   resolved "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-3.1.0.tgz#640a94bf9847f321800403cd273af60665c73397"
   dependencies:
@@ -1967,6 +1967,15 @@ cosmiconfig@^3.0.1, cosmiconfig@^3.1.0:
     parse-json "^3.0.0"
     require-from-string "^2.0.1"
 
+cosmiconfig@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.npmjs.org/cosmiconfig/-/cosmiconfig-4.0.0.tgz#760391549580bbd2df1e562bc177b13c290972dc"
+  dependencies:
+    is-directory "^0.3.1"
+    js-yaml "^3.9.0"
+    parse-json "^4.0.0"
+    require-from-string "^2.0.1"
+
 cp-file@^4.1.1:
   version "4.2.0"
   resolved "https://registry.npmjs.org/cp-file/-/cp-file-4.2.0.tgz#715361663b71ede0b6dddbc3c80e2ba02e725ec3"