Bump rollup from 0.45.2 to 0.51.5

Bumps [rollup](https://github.com/rollup/rollup) from 0.45.2 to 0.51.5.
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v0.45.2...v0.51.5)

package.json

@@ -67,7 +67,7 @@
     "nyc": "^11.3.0",
     "remark": "^8.0.0",
     "remark-lint": "^6.0.0",
-    "rollup": "^0.45.2",
+    "rollup": "^0.51.5",
     "rollup-plugin-babel": "^2.7.1",
     "rollup-plugin-commonjs": "^8.1.0"
   },

yarn.lock

@@ -3511,11 +3511,9 @@ rollup-pluginutils@^2.0.1:
     estree-walker "^0.3.0"
     micromatch "^2.3.11"
 
-rollup@^0.45.2:
-  version "0.45.2"
-  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.45.2.tgz#63a284c2b31234656f24e9e9717fabb6a7f0fa43"
-  dependencies:
-    source-map-support "^0.4.0"
+rollup@^0.51.5:
+  version "0.51.5"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.51.5.tgz#5caf9101fcaefe344065701ece7de697631a8035"
 
 run-async@^2.2.0:
   version "2.3.0"
@@ -3609,7 +3607,7 @@ sort-keys@^2.0.0:
   dependencies:
     is-plain-obj "^1.0.0"
 
-source-map-support@^0.4.0, source-map-support@^0.4.2:
+source-map-support@^0.4.2:
   version "0.4.15"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.4.15.tgz#03202df65c06d2bd8c7ec2362a193056fef8d3b1"
   dependencies: