Don't limit upper version on wcwidth

Also it had a typo which limited it to 2.0 instead of 0.2, so this
doesn't change anything.

requirements.txt

@@ -1,4 +1,4 @@
 requests>=2.13,<3.0
 beautifulsoup4>=4.5.0,<5.0
-wcwidth>=0.1.7,<2.0
+wcwidth>=0.1.7
 urwid>=2.0.0,<3.0

setup.py

@@ -40,7 +40,7 @@ setup(
     install_requires=[
         "requests>=2.13,<3.0",
         "beautifulsoup4>=4.5.0,<5.0",
-        "wcwidth>=0.1.7,<2.0",
+        "wcwidth>=0.1.7",
         "urwid>=2.0.0,<3.0",
     ],
     entry_points={