Bump pixelmatch from 5.0.2 to 5.1.0

Bumps [pixelmatch](https://github.com/mapbox/pixelmatch) from 5.0.2 to 5.1.0.
- [Release notes](https://github.com/mapbox/pixelmatch/releases)
- [Commits](https://github.com/mapbox/pixelmatch/compare/v5.0.2...v5.1.0)

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

package-lock.json

@@ -8325,9 +8325,9 @@
       }
     },
     "pixelmatch": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/pixelmatch/-/pixelmatch-5.0.2.tgz",
-      "integrity": "sha512-b65UpTI40rGFY8QwN6IYuCbpmwAOL6M8d6voX4F3zR99UmDqh7r2QWLxoeHOazBRgEmDUdqNVESDREqFxQS7rQ==",
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/pixelmatch/-/pixelmatch-5.1.0.tgz",
+      "integrity": "sha512-HqtgvuWN12tBzKJf7jYsc38Ha28Q2NYpmBL9WostEGgDHJqbTLkjydZXL1ZHM02ZnB+Dkwlxo87HBY38kMiD6A==",
       "dev": true,
       "requires": {
         "pngjs": "^3.4.0"

package.json

@@ -82,7 +82,7 @@
     "marked": "0.7.0",
     "mocha": "6.2.2",
     "ol-mapbox-style": "^5.0.2",
-    "pixelmatch": "^5.0.0",
+    "pixelmatch": "^5.1.0",
     "pngjs": "^3.4.0",
     "proj4": "2.5.0",
     "puppeteer": "~1.20.0",