[FABCN-415] Lock grpc-js to 1.0.3 (#170)

@grpc/grpc-js updated to 1.1.0; this has caused the initial request to the
peer on chaincode start to fail.

Dropping back to 1.0.3 resolves the issue.

See FABCN-415

Signed-off-by: Matthew B White <whitemat@uk.ibm.com>

libraries/fabric-shim/package.json

@@ -55,7 +55,7 @@
   },
   "dependencies": {
     "@fidm/x509": "^1.2.1",
-    "@grpc/grpc-js": "^1.0.3",
+    "@grpc/grpc-js": "1.0.3",
     "@grpc/proto-loader": "^0.5.4",
     "@types/node": "^8.9.4",
     "ajv": "^6.5.5",