fix(preprocessor): Use _.contains instead of _.includes

Re-enables support for lodash 2

lib/preprocessor.js

@@ -50,7 +50,7 @@ function createCoveragePreprocessor (logger, helper, basePath, reporters, covera
     }, {})
 
   // if coverage reporter is not used, do not preprocess the files
-  if (!_.includes(reporters, 'coverage')) {
+  if (!_.contains(reporters, 'coverage')) {
     return function (content, _, done) {
       done(content)
     }