Upgrade wekan-accounts-sandstorm to Meteor 2.7 dependencies

Clone of Repository:
https://github.com/wekan/meteor-accounts-sandstorm/commit/3ba279df9265d955d2aa8a79e1b796165acb128c

.meteor/versions

@@ -224,6 +224,6 @@ useraccounts:flow-routing@1.15.0
 useraccounts:unstyled@1.14.2
 webapp@1.13.1
 webapp-hashing@1.1.0
-wekan-accounts-sandstorm@0.7.0
+wekan-accounts-sandstorm@0.8.0
 wekan-markdown@1.0.9
 zimme:active-route@2.3.2

packages/wekan-accounts-sandstorm/package.js

@@ -21,16 +21,16 @@
 
 Package.describe({
   summary: "Login service for Sandstorm.io applications",
-  version: "0.7.0",
+  version: "0.8.0",
   name: "wekan-accounts-sandstorm",
   git: "https://github.com/sandstorm-io/meteor-accounts-sandstorm.git"
 });
 
 Package.onUse(function(api) {
-  api.versionsFrom('1.5.1');
+  api.versionsFrom('2.7');
 
   api.use('random', ['client', 'server']);
-  api.use('accounts-base@2.2.2', ['client', 'server'], {weak: true});
+  api.use('accounts-base', ['client', 'server'], {weak: true});
   api.use('webapp', 'server');
   api.use('http', 'client');
   api.use('tracker', 'client');