Fix doc gen

packages/sol-coverage/package.json

@@ -33,11 +33,13 @@
         "@0x/subproviders": "^3.0.3",
         "@0x/typescript-typings": "^4.0.0",
         "ethereum-types": "^2.0.0",
-        "lodash": "^4.17.11"
+        "lodash": "^4.17.11",
+        "web3-provider-engine": "14.0.6"
     },
     "devDependencies": {
         "@0x/tslint-config": "^3.0.0",
         "@types/node": "*",
+        "@types/web3-provider-engine": "^14.0.0",
         "npm-run-all": "^4.1.2",
         "nyc": "^11.0.1",
         "shx": "^0.2.2",

packages/sol-coverage/src/index.ts

@@ -8,13 +8,7 @@ export {
     Sources,
 } from '@0x/sol-tracing-utils';
 
-export {
-    JSONRPCRequestPayload,
-    SupportedProvider,
-    JSONRPCErrorCallback,
-    JSONRPCResponsePayload,
-    JSONRPCResponseError,
-} from 'ethereum-types';
+export { JSONRPCRequestPayload, JSONRPCResponsePayload, JSONRPCResponseError } from 'ethereum-types';
 
 export {
     JSONRPCRequestPayloadWithMethod,
@@ -23,3 +17,5 @@ export {
     OnNextCompleted,
     Callback,
 } from '@0x/subproviders';
+
+export import Web3ProviderEngine = require('web3-provider-engine');