chore: add monorepo version (#201)

The first release PR put the monorepo at v1.0.0 b/c I forgot to add the
version to the manifest:
#200.

Author: gadomski

.release-please-manifest.json

@@ -1,4 +1,5 @@
 {
+  ".": "0.1.0",
   "packages/deck.gl-geotiff": "0.1.0",
   "packages/deck.gl-raster": "0.1.0",
   "packages/deck.gl-zarr": "0.1.0",