Merge pull request #25 from styled-components/jacobp100-patch-1

Fix spec compliance when omitting flex-grow

Author: jacobp100

src/transforms/flex.js

@@ -2,7 +2,7 @@ const { tokens } = require('../tokenTypes');
 
 const { NONE, NUMBER, LENGTH, SPACE } = tokens;
 
-const defaultFlexGrow = 0;
+const defaultFlexGrow = 1;
 const defaultFlexShrink = 1;
 const defaultFlexBasis = 0;