Lock down Babel to 7-beta.40
Lock down Babel to 7-beta.40

Summary: This will lock down the plugins to babel version 7-beta.40

Reviewed By: davidaurelio

Differential Revision: D7707160

fbshipit-source-id: 6aec7f98348cac6ddd680c73ea4e36e0fb23e2a8

myntra/react-native,myntra/react-native,hammerandchisel/react-native,javache/react-native,myntra/react-native,hammerandchisel/react-native,exponentjs/react-native,hoangpham95/react-native,facebook/react-native,exponent/react-native,janicduplessis/react-native,hoangpham95/react-native,hoangpham95/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,janicduplessis/react-native,hammerandchisel/react-native,pandiaraj44/react-native,exponentjs/react-native,hoangpham95/react-native,janicduplessis/react-native,exponent/react-native,exponent/react-native,exponentjs/react-native,facebook/react-native,exponentjs/react-native,exponent/react-native,pandiaraj44/react-native,hoangpham95/react-native,myntra/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,facebook/react-native,myntra/react-native,arthuralee/react-native,exponentjs/react-native,arthuralee/react-native,javache/react-native,hammerandchisel/react-native,arthuralee/react-native,exponentjs/react-native,exponent/react-native,javache/react-native,exponent/react-native,javache/react-native,javache/react-native,hoangpham95/react-native,pandiaraj44/react-native,facebook/react-native,arthuralee/react-native,hammerandchisel/react-native,hoangpham95/react-native,myntra/react-native,exponent/react-native,myntra/react-native,arthuralee/react-native,hammerandchisel/react-native,myntra/react-native,janicduplessis/react-native,myntra/react-native,exponentjs/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,exponent/react-native,pandiaraj44/react-native,hoangpham95/react-native,hammerandchisel/react-native,facebook/react-native,pandiaraj44/react-native,exponentjs/react-native,hammerandchisel/react-native,janicduplessis/react-native