Bump @graphprotocol/graph-ts from 0.20.0 to 0.20.1 (#155)

Bumps @graphprotocol/graph-ts from 0.20.0 to 0.20.1.

---
updated-dependencies:
- dependency-name: "@graphprotocol/graph-ts"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -38,7 +38,7 @@
   },
   "devDependencies": {
     "@graphprotocol/graph-cli": "^0.20.1",
-    "@graphprotocol/graph-ts": "^0.20.0",
+    "@graphprotocol/graph-ts": "^0.20.1",
     "@types/chai": "^4.2.19",
     "@types/chai-spies": "^1.0.3",
     "@types/mocha": "^8.2.2",