Add function to update contributor profile to wrapper

The function updates the contributor profile,
adds the new profile to IPFS and does the contract call to update
the profile hash

lib/contracts/contributor.js

@@ -58,6 +58,30 @@ class Contributor extends Record {
         return this.functions.addContributor(...contributor, callOptions);
       });
   }
+
+  updateProfile(contributorId, updateAttr, callOptions = {}) {
+    return this.getById(contributorId).then(async (contributor) => {
+      let updatedContributorAttr = Object.assign(contributor, updateAttr)
+      let updatedContributor = new ContributorSerializer(updatedContributorAttr);
+
+      try { await updatedContributor.validate(); }
+      catch (error) { return Promise.reject(error); }
+
+      const jsonStr = updatedContributor.serialize();
+
+      return this.ipfs
+        .add(jsonStr)
+        .then(ipfsHashAttr => {
+          return this.functions.updateContributorProfileHash(
+            contributorId,
+            ipfsHashAttr.hashDigest,
+            ipfsHashAttr.hashFunction,
+            ipfsHashAttr.hashSize,
+            callOptions
+          );
+        });
+    });
+  }
 }
 
 module.exports = Contributor;