fix(babel): removed inline transpilation that appears to be unnecessary (#394)

Author: travi

bin/semantic-release.js

@@ -1,6 +1,4 @@
 #!/usr/bin/env node
-require('@babel/register')({only: 'semantic-release-cli/src'});
-require('@babel/polyfill');
 
 require('../src')().catch(() => {
   process.exitCode = 1;