Remove unused/ unnecessary babel-runtime dependency

[avindra]

Similar fix to: react-component/drawer#121

Noticed this problem when I saw core-js 2.x being included in a dependency tree for an application I work on:

yarn why core-js
yarn why v1.16.0
[1/4] Why do we have the module "core-js"...?
[2/4] Initialising dependency graph...
[3/4] Finding dependency...
[4/4] Calculating file sizes...
=> Found "[email protected]"
info Has been hoisted to "core-js"
info Reasons this module exists
   - Hoisted from "@babel#node#core-js"
   - Hoisted from "recharts#core-js"
   - Hoisted from "react-scripts#react-app-polyfill#core-js"
info Disk size without dependencies: "7.13MB"
info Disk size with unique dependencies: "7.13MB"
info Disk size with transitive dependencies: "7.13MB"
info Number of shared dependencies: 0
=> Found "babel-runtime#[email protected]"
info This module exists because "rc-drawer#rc-util#babel-runtime" depends on it.
info Disk size without dependencies: "7.68MB"
info Disk size with unique dependencies: "7.68MB"
info Disk size with transitive dependencies: "7.68MB"
info Number of shared dependencies: 0

[coveralls]

Coverage remained the same at 23.422% when pulling 320b64c on avindra:patch-1 into a27f7f6 on react-component:master.

[kimyu-ng]

@afc163 can you take a look at this as this obsolete dependency is required by rc-trigger and rc-trigger is required rc-time-picker.

[avindra]

Should be safe to remove. The quick way to tell is that babel-runtime is only referenced in package.json (nowhere in build configurations, source code, or otherwise).

[avindra]

Looks like it was addressed in 0f54ab8#diff-b9cfc7f2cdf78a7f4b91a753d10865a2

and #91 by @zombieJ

So I'm closing this PR.