Bump yaml from 1.3.2 to 1.4.0 (desktop#217)

Bumps [yaml](https://github.com/eemeli/yaml) from 1.3.2 to 1.4.0.
- [Release notes](https://github.com/eemeli/yaml/releases)
- [Commits](eemeli/yaml@v1.3.2...v1.4.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -34,6 +34,6 @@
     "request-promise": "^4.2.4",
     "semver": "^5.6.0",
     "typescript": "^3.3.3333",
-    "yaml": "^1.3.2"
+    "yaml": "^1.4.0"
   }
 }