fix: update cosmiconfig to safe >=5 #599

* fix: add @lerna/project to repository dependencies

* feat(load): update cosmiconfig #599

* fix: adapt to new cosmiconfig api

Author: escapedcat

@commitlint/load/package.json

@@ -59,6 +59,7 @@
   "devDependencies": {
     "@commitlint/test": "^7.5.0",
     "@commitlint/utils": "^7.5.0",
+    "alva": "^1.0.17",
     "ava": "0.22.0",
     "babel-cli": "6.26.0",
     "babel-preset-commitlint": "^7.5.0",
@@ -73,7 +74,7 @@
     "@commitlint/execute-rule": "^7.5.0",
     "@commitlint/resolve-extends": "^7.5.0",
     "babel-runtime": "^6.23.0",
-    "cosmiconfig": "^4.0.0",
+    "cosmiconfig": "^5.2.0",
     "lodash": "4.17.11",
     "resolve-from": "^4.0.0"
   }

@commitlint/load/src/index.js

@@ -86,12 +86,12 @@ export default async (seed = {}, options = {cwd: process.cwd()}) => {
 };
 
 async function loadConfig(cwd, configPath) {
-	const explorer = cosmiconfig('commitlint', {
-		rcExtensions: true,
-		configPath: configPath ? path.resolve(cwd, configPath) : null
-	});
+	const explorer = cosmiconfig('commitlint');
 
-	const local = await explorer.load(cwd);
+	const explicitPath = configPath ? path.join(cwd, configPath) : undefined;
+	const explore = explicitPath ? explorer.load : explorer.search;
+	const searchPath = explicitPath ? explicitPath : cwd;
+	const local = await explore(searchPath);
 
 	if (local) {
 		return local;