Upgrade babel-plugin-mockable-imports

This fixes a code generation bug which broke the latest version of
babel-plugin-transform-async-to-promises.

package.json

@@ -20,7 +20,7 @@
     "aws-sdk": "^2.345.0",
     "babel-plugin-angularjs-annotate": "^0.10.0",
     "babel-plugin-istanbul": "^5.1.0",
-    "babel-plugin-mockable-imports": "^1.1.0",
+    "babel-plugin-mockable-imports": "^1.5.1",
     "babel-plugin-transform-async-to-promises": "^0.8.6",
     "babelify": "^10.0.0",
     "browserify": "^16.2.3",

yarn.lock

@@ -1381,10 +1381,10 @@ babel-plugin-istanbul@^5.1.0:
     istanbul-lib-instrument "^3.3.0"
     test-exclude "^5.2.3"
 
-babel-plugin-mockable-imports@^1.1.0:
-  version "1.5.0"
-  resolved "https://registry.yarnpkg.com/babel-plugin-mockable-imports/-/babel-plugin-mockable-imports-1.5.0.tgz#4cc5aa787ec2e0cb038c4d818a83383b8124c97c"
-  integrity sha512-INesYNt7McIrU7er5ZLEphXvW5bpxlFpw5pO/M3rkpeLkH5VZRWcwU8blclq7dDjuUypSRdZN0SxxpxKxlVEFA==
+babel-plugin-mockable-imports@^1.5.1:
+  version "1.5.1"
+  resolved "https://registry.yarnpkg.com/babel-plugin-mockable-imports/-/babel-plugin-mockable-imports-1.5.1.tgz#b6f50604b9b80b75176e220bdbfb9a6a414b0e07"
+  integrity sha512-n3M7UIDIyun3ztI11WUWfM2dqr+3ERn1EJ0z9w+WY6cHvtqhIHCGDFdhY2bY2BD20zPjf1zoaF+Iva+0VJLp/w==
 
 babel-plugin-transform-async-to-promises@^0.8.6:
   version "0.8.11"