Merge pull request #106 from searxng/dependabot/pip/master/flask-2.0.1

Bump flask from 1.1.2 to 2.0.1

requirements.txt

@@ -1,7 +1,7 @@
 certifi==2021.5.30
 babel==2.9.1
 flask-babel==2.0.0
-flask==1.1.2
+flask==2.0.1
 jinja2==3.0.1
 lxml==4.6.3
 pygments==2.9.0