Bump eslint from 2.7.0 to 6.5.1 (#31)

Bumps [eslint](https://github.com/eslint/eslint) from 2.7.0 to 6.5.1.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/eslint/eslint/compare/v2.7.0...v6.5.1)

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

packages/ripple-keypairs/package.json

@@ -28,7 +28,7 @@
     "babel-loader": "^5.3.2",
     "codecov.io": "^0.1.6",
     "coveralls": "~2.11.4",
-    "eslint": "2.7.0",
+    "eslint": "6.5.1",
     "eventemitter2": "^0.4.14",
     "istanbul": "~0.3.5",
     "map-stream": "~0.1.0",