Revert "Remove retainLines from babel-jest (jestjs#5439)"

This reverts commit 6635d93.

Author: SimenB

packages/babel-jest/src/index.js

@@ -69,6 +69,7 @@ const createTransformer = (options: any) => {
   options = Object.assign({}, options, {
     plugins: (options && options.plugins) || [],
     presets: ((options && options.presets) || []).concat([jestPreset]),
+    retainLines: true,
     sourceMaps: 'inline',
   });
   delete options.cacheDirectory;