v0.8.0

• [breaking] Uses observables instead of event emitters (#44). onError must be written like this now:

  const subscription = api.onError.subscribe(error => {
    // handle error
  })
  
  subscription.unsubscribe()

• [breaking] Default useApiQuery#refetch to use deduplicate: false (#49)
• [breaking] Removes withApi (#44)
• [feature] Adds useMutation hook (#48)

    const [createUser, {mutating: creatingUser}] = useApiMutation({
    mutation: (firstName: string, lastName: string) => async (api) => {
      return api.request(UserEndpoints.create({firstName, lastName}))
    },
    onError: (error) => console.error(error),
    onSuccess: (user) => console.log(`Created user ${firstName}`)
  })
  
  // usage
  createUser('Thomas', 'Dashney')

• [feature] Adds basic server-side rendering support by removing Headers, Request, and Response dependencies. All it needs is a fetch polypill now (#44)
• [bugfix] Fixes bug where content-type: application/json; charset=utf8 is not parsed as JSON (#31)