update per issue#161

[woodchuck00]

update per issue#161
#161

[robertofd1995]

@dgrubelic could you approve this PR? I had the same problem as in the issue and changing the code to this fix it.

Vue.use(VueAuthenticate, {
      providers: {
        linkedin: {
          clientId: '860a9egnzmfo19',
          redirectUri: 'http://localhost:8080/',
          url: 'http://localhost:8000/api/login/social/token_user/linkedin-oauth2/',
          scope: ['r_emailaddress', 'r_liteprofile', 'w_member_social'],
          requiredUrlParams: ['state', 'scope'], // needed
          tokenPath: 'token' // I also need this in my project
        }
      }
    })