disable "uglifyPure" mode by default

unfortunately this feature seems to dramatically inflate the
amount of time babel takes to process files... perhaps there is
an unintended loop happening or something of the like

Author: quantizor

src/utils/options.js

@@ -8,4 +8,4 @@ export const useFileName = (state) =>getOption(state, 'fileName')
 export const useMinify = (state) => getOption(state, 'minify')
 export const useCSSPreprocessor = (state) => getOption(state, 'preprocess', false) // EXPERIMENTAL
 export const useTranspileTemplateLiterals = (state) => getOption(state, 'transpileTemplateLiterals')
-export const useUglifyPure = (state) => getOption(state, 'uglifyPure')
+export const useUglifyPure = (state) => getOption(state, 'uglifyPure', false)

test/fixtures/20-annotate-styled-calls-with-uglify-pure-comments/.babelrc

@@ -5,6 +5,7 @@
       "fileName": false,
       "transpileTemplateLiterals": false,
       "preprocess": false,
+      "uglifyPure": true
     }]
   ]
 }

test/fixtures/21-annotate-keyframes-with-uglify-pure-comments/.babelrc

@@ -3,6 +3,7 @@
     ["../../../src", {
       "preprocess": true,
       "ssr": true,
+      "uglifyPure": true
     }]
   ]
 }