Merge branch 'master' into chore/linter

# Conflicts:
#	lib/contracts/contribution.js
#	lib/contracts/contributor.js
#	lib/contracts/proposal.js
#	lib/kredits.js
#	lib/serializers/contributor.js
#	yarn.lock

lib/kredits.js

@@ -1,5 +1,4 @@
 const ethers = require('ethers');
-const RSVP = require('rsvp');
 
 const Preflight = require('./utils/preflight');
 
@@ -57,7 +56,8 @@ class Kredits {
           );
         });
       });
-      return RSVP.all(addressPromises).then(() => { return this; });
+
+      return Promise.all(addressPromises).then(() => { return this });
     });
   }