feat: support optional proto3 fields

This was implemented in ts-protoc-gen in
improbable-eng/ts-protoc-gen#275 and released
nearly a year ago in [email protected]; glancing through the issue
history it looks like the only reason this hasn't been bumped yet is
because no one's tried to contribute it.

package.json

@@ -37,7 +37,7 @@
     "rollup-plugin-commonjs": "10.1.0",
     "rollup-plugin-node-resolve": "5.2.0",
     "source-map-support": "0.5.19",
-    "ts-protoc-gen": "0.14.0",
+    "ts-protoc-gen": "0.15.0",
     "tsickle": "0.39.1",
     "tsutils": "3.17.1",
     "typescript": "3.9.7",

yarn.lock

@@ -1144,10 +1144,10 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/google-protobuf/-/google-protobuf-3.12.2.tgz#50ce9f9b6281235724eb243d6a83e969a2176e53"
   integrity sha512-4CZhpuRr1d6HjlyrxoXoocoGFnRYgKULgMtikMddA9ztRyYR59Aondv2FioyxWVamRo0rF2XpYawkTCBEQOSkA==
 
-google-protobuf@^3.6.1:
-  version "3.10.0"
-  resolved "https://registry.yarnpkg.com/google-protobuf/-/google-protobuf-3.10.0.tgz#f36171128090615049f9b0e42252b1a10a4bc534"
-  integrity sha512-d0cMO8TJ6xtB/WrVHCv5U81L2ulX+aCD58IljyAN6mHwdHHJ2jbcauX5glvivi3s3hx7EYEo7eUA9WftzamMnw==
+google-protobuf@^3.15.5:
+  version "3.19.4"
+  resolved "https://registry.yarnpkg.com/google-protobuf/-/google-protobuf-3.19.4.tgz#8d32c3e34be9250956f28c0fb90955d13f311888"
+  integrity sha512-OIPNCxsG2lkIvf+P5FNfJ/Km95CsXOBecS9ZcAU6m2Rq3svc0Apl9nB3GMDNKfQ9asNv4KjyAqGwPQFrVle3Yg==
 
 graceful-fs@^4.1.2:
   version "4.2.2"
@@ -2539,12 +2539,12 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/toidentifier/-/toidentifier-1.0.0.tgz#7e1be3470f1e77948bc43d94a3c8f4d7752ba553"
   integrity sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==
 
-ts-protoc-gen@0.14.0:
-  version "0.14.0"
-  resolved "https://registry.npmjs.org/ts-protoc-gen/-/ts-protoc-gen-0.14.0.tgz#a6f4c3fc37d1d449915551c18404fb7e9aa8fef6"
-  integrity sha512-2z6w2HioMCMVNcgNHBcEvudmQfzrn+3BjAlz+xgYZ9L0o8n8UG8WUiTJcbXHFiEg2SU8IltwH2pm1otLoMSKwg==
+ts-protoc-gen@0.15.0:
+  version "0.15.0"
+  resolved "https://registry.yarnpkg.com/ts-protoc-gen/-/ts-protoc-gen-0.15.0.tgz#2fec5930b46def7dcc9fa73c060d770b7b076b7b"
+  integrity sha512-TycnzEyrdVDlATJ3bWFTtra3SCiEP0W0vySXReAuEygXCUr1j2uaVyL0DhzjwuUdQoW5oXPwk6oZWeA0955V+g==
   dependencies:
-    google-protobuf "^3.6.1"
+    google-protobuf "^3.15.5"
 
 [email protected]:
   version "0.39.1"