Merge pull request #116 from practical-nlp/dependabot/pip/lxml-4.9.1

Bump lxml from 4.5.1 to 4.9.1

Author: suranah

requirements.txt

@@ -76,7 +76,7 @@ kiwisolver==1.2.0
 ktrain==0.2.2
 lazy-object-proxy==1.3.1
 lime==0.2.0.1
-lxml==4.5.1
+lxml==4.9.1
 Markdown==3.2.2
 MarkupSafe==1.1.1
 matplotlib==3.2.2