wip! Pin Babel dependencies

Author: novemberborn

package.json

@@ -61,10 +61,10 @@
 		"@ava/babel-preset-stage-4": "^2.0.0-beta.4",
 		"@ava/babel-preset-transform-test-files": "^4.0.0-beta.3",
 		"@ava/write-file-atomic": "^2.2.0",
-		"@babel/core": "^7.0.0-beta.40",
-		"@babel/generator": "^7.0.0-beta.40",
-		"@babel/plugin-syntax-async-generators": "^7.0.0-beta.40",
-		"@babel/plugin-syntax-object-rest-spread": "^7.0.0-beta.40",
+		"@babel/core": "7.0.0-beta.40",
+		"@babel/generator": "7.0.0-beta.40",
+		"@babel/plugin-syntax-async-generators": "7.0.0-beta.40",
+		"@babel/plugin-syntax-object-rest-spread": "7.0.0-beta.40",
 		"@concordance/react": "^1.0.0",
 		"ansi-escapes": "^3.1.0",
 		"ansi-styles": "^3.2.1",