chore(deps): update dependency typescript to ~3.2.0 (#459)

Author: renovate[bot]

handwritten/spanner/package.json

@@ -108,7 +108,7 @@
     "sinon": "^7.1.0",
     "stats-lite": "^2.1.1",
     "time-span": "^2.0.0",
-    "typescript": "~3.1.3",
+    "typescript": "~3.2.0",
     "uuid": "^3.3.2",
     "yargs": "^12.0.1"
   },