fix(cubejs-react): add core-js dependency (#107)

Author: ferndopolis

packages/cubejs-react/package.json

@@ -5,6 +5,7 @@
   "author": "Statsbot, Inc.",
   "dependencies": {
     "@babel/runtime": "^7.1.2",
+    "core-js": "^2.5.3",
     "prop-types": "^15.6.2",
     "ramda": "^0.25.0",
     "react": "^16.5.2"

packages/cubejs-react/yarn.lock

@@ -8,6 +8,11 @@
   dependencies:
     regenerator-runtime "^0.12.0"
 
+core-js@^2.5.3:
+  version "2.6.5"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
+  integrity sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==
+
 "js-tokens@^3.0.0 || ^4.0.0":
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"