build(deps): bump beautifulsoup4 from 4.9.0 to 4.9.1

Bumps [beautifulsoup4](http://www.crummy.com/software/BeautifulSoup/bs4/) from 4.9.0 to 4.9.1.

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
-beautifulsoup4==4.9.0
+beautifulsoup4==4.9.1
 cleverwrap==0.3.0.2
 feedparser==5.2.1
 forecastiopy==0.22