Bump babel to 7 beta.54
Bump babel to 7 beta.54

Summary:
@public
Bump Babel to version 7 beta 54

This version has reversed the windows path denormalization so we need it to be able to fix windows paths.

Reviewed By: rafeca

Differential Revision: D8894700

fbshipit-source-id: 3ae1480b77380cae8070621d4729b21a34c4b928

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