Fix Raven.setUserContext typescript definition. (#1500)

This setUserContext is actually very permissive so `any` may be a better option here.

Author: fabien0102

packages/raven-js/typescript/raven-tests.ts

@@ -65,6 +65,14 @@ Raven.setUserContext({
   email: 'matt@example.com',
   id: '123'
 });
+Raven.setUserContext({
+  email: 'matt@example.com',
+  id: '123',
+  projects: [
+    {id: 0, name: 'my project'},
+    {id: 1, name: 'my other project'},
+  ]
+});
 
 Raven.setExtraContext({foo: 'bar'});
 Raven.setExtraContext();

packages/raven-js/typescript/raven.d.ts

@@ -226,7 +226,7 @@ declare namespace Raven {
         * @return {Raven}
         */
     setUserContext(user?: {
-      [key: string]: string | number | boolean | null | void;
+      [key: string]: any;
     }): RavenStatic;
 
     /*