Bump tsd from 0.14.0 to 0.15.0 (#139)

Bumps [tsd](https://github.com/SamVerschueren/tsd) from 0.14.0 to 0.15.0.
- [Release notes](https://github.com/SamVerschueren/tsd/releases)
- [Commits](tsdjs/tsd@v0.14.0...v0.15.0)

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package.json

@@ -30,7 +30,7 @@
     "proxyquire": "^2.1.3",
     "standard": "^16.0.3",
     "tap": "^15.0.2",
-    "tsd": "^0.14.0",
+    "tsd": "^0.15.0",
     "typescript": "^4.0.5"
   },
   "dependencies": {}