Incorrect splitting for separating hashtags

In the case where there is another tweet, a picture or similar embedded in a tweet, the text of the tweet and this attachment are not separated. See this example:
https://twitter.com/ACM_CHIIR/status/837247495864479744
`Hooray - the proceedings arrived today! #chiir2017pic.twitter.com/lLZMfTpR0F`

This is by itself unsatisfying, but also leads to problems in the detection of a hashtag.

If like in the example, the last token of a tweet before the attachment is a hashtag, `tweet.getHashtags()` will output `#chiir2017pic` as a hashtag, where it should simply be `#chiir2017 `.