fix(browserslist): Fix that browserslist was configured but not installed

After this change, `npx browserslist` outputs:
chrome 56

package.json

@@ -136,6 +136,7 @@
     "babel-preset-stage-0": "^6.24.1",
     "babel-register": "^6.24.1",
     "babili-webpack-plugin": "^0.1.2",
+    "browserslist": "^2.11.0",
     "chalk": "^2.0.1",
     "concurrently": "^3.5.0",
     "cross-env": "^5.0.0",

yarn.lock

@@ -1728,6 +1728,13 @@ browserslist@^1.1.1, browserslist@^1.1.3, browserslist@^1.3.6, browserslist@^1.5
     caniuse-db "^1.0.30000639"
     electron-to-chromium "^1.2.7"
 
+browserslist@^2.11.0:
+  version "2.11.0"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-2.11.0.tgz#50350d6873a82ebe0f3ae5483658c571ae5f9d7d"
+  dependencies:
+    caniuse-lite "^1.0.30000784"
+    electron-to-chromium "^1.3.30"
+
 bs58@=2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/bs58/-/bs58-2.0.0.tgz#72b713bed223a0ac518bbda0e3ce3f4817f39eb5"
@@ -1888,6 +1895,10 @@ caniuse-lite@^1.0.30000670:
   version "1.0.30000683"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000683.tgz#a7573707cf2acc9217ca6484d1dfbc9f13898364"
 
+caniuse-lite@^1.0.30000784:
+  version "1.0.30000787"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000787.tgz#a76c4fa1d6ac00640447ec83c1e7c6b33dd615c5"
+
 capture-stack-trace@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.0.tgz#4a6fa07399c26bba47f0b2496b4d0fb408c5550d"
@@ -3173,10 +3184,20 @@ electron-publish@19.49.0:
     fs-extra-p "^4.5.0"
     mime "^2.0.3"
 
+electron-releases@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/electron-releases/-/electron-releases-2.1.0.tgz#c5614bf811f176ce3c836e368a0625782341fd4e"
+
 electron-to-chromium@^1.2.7, electron-to-chromium@^1.3.11:
   version "1.3.14"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.14.tgz#64af0f9efd3c3c6acd57d71f83b49ca7ee9c4b43"
 
+electron-to-chromium@^1.3.30:
+  version "1.3.30"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.30.tgz#9666f532a64586651fc56a72513692e820d06a80"
+  dependencies:
+    electron-releases "^2.1.0"
+
 electron@^1.7.10:
   version "1.7.10"
   resolved "https://registry.yarnpkg.com/electron/-/electron-1.7.10.tgz#3a3e83d965fd7fafe473be8ddf8f472561b6253d"