Bump @babel/cli from 7.6.3 to 7.6.4

Bumps [@babel/cli](https://github.com/babel/babel) from 7.6.3 to 7.6.4.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.6.3...v7.6.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -273,7 +273,7 @@
     "xterm-addon-webgl": "^0.2.1"
   },
   "devDependencies": {
-    "@babel/cli": "7.6.3",
+    "@babel/cli": "7.6.4",
     "@babel/core": "7.6.3",
     "@babel/plugin-proposal-class-properties": "^7.5.5",
     "@babel/plugin-proposal-numeric-separator": "^7.2.0",

yarn.lock

@@ -57,10 +57,10 @@
     imurmurhash "^0.1.4"
     slide "^1.1.5"
 
-"@babel/cli@7.6.3":
-  version "7.6.3"
-  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.6.3.tgz#1b0c62098c8a5e01e4a4a59a52cba9682e7e0906"
-  integrity sha512-kWKOEeuylpa781yCeA5//eEx1u3WtLZqbi2VWXLKmb3QDPb5T2f7Yk311MK7bvvjR70dluAeiu4VXXsG1WwJsw==
+"@babel/cli@7.6.4":
+  version "7.6.4"
+  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.6.4.tgz#9b35a4e15fa7d8f487418aaa8229c8b0bc815f20"
+  integrity sha512-tqrDyvPryBM6xjIyKKUwr3s8CzmmYidwgdswd7Uc/Cv0ogZcuS1TYQTLx/eWKP3UbJ6JxZAiYlBZabXm/rtRsQ==
   dependencies:
     commander "^2.8.1"
     convert-source-map "^1.1.0"
@@ -70,7 +70,7 @@
     mkdirp "^0.5.1"
     output-file-sync "^2.0.0"
     slash "^2.0.0"
-    source-map "^0.6.1"
+    source-map "^0.5.0"
   optionalDependencies:
     chokidar "^2.1.8"