removed hardcoded dependencies of requests to fix incompatibility

requirements.txt

@@ -1,5 +1,4 @@
 boto==2.40.0
-chardet==2.3.0
 click==6.7
 configparser==3.5.0
 cryptography==3.3.2
@@ -7,7 +6,6 @@ enum34==1.1.6
 Flask==1.0
 future==0.15.2
 httplib2==0.19.0
-idna==2.1
 ipaddress==1.0.16
 itsdangerous==0.24
 Jinja2==2.11.3
@@ -24,6 +22,5 @@ pyxdg==0.26
 requests==2.20.0
 scour==0.32
 six==1.10.0
-urllib3==1.26.5
 virtualenv==15.1.0
-Werkzeug==0.15.3
+Werkzeug==0.15.5