Adjust proposals for format changes

lib/contracts/proposal.js

@@ -7,8 +7,7 @@ const Base = require('./base');
 class Proposal extends Base {
   all() {
     return this.functions.proposalsCount()
-      .then((count) => {
-        count = count.toNumber();
+      .then(count => {
         let proposals = [];
 
         for (let id = 1; id <= count; id++) {
@@ -20,10 +19,8 @@ class Proposal extends Base {
   }
 
   getById(id) {
-    id = ethers.utils.bigNumberify(id);
-
     return this.functions.getProposal(id)
-      .then((data) => {
+      .then(data => {
         return this.ipfs.catAndMerge(data, ContributionSerializer.deserialize);
       });
   }