Fixed IOError in setup.py.

setup.py

@@ -14,10 +14,16 @@ if sys.version_info < (2, 7):
     requirements.append('argparse>=1.2.1')
 
 
+try:
+    long_description = open('README.md').read()
+except IOError:
+    long_description = ''
+
+
 setup(
     name='httpie',version=httpie.__version__,
     description=httpie.__doc__.strip(),
-    long_description=open('README.md').read(),
+    long_description=long_description,
     url='http://httpie.org/',
     download_url='https://github.com/jkbr/httpie',
     author=httpie.__author__,
@@ -48,5 +54,5 @@ setup(
         'Topic :: System :: Networking',
         'Topic :: Terminals',
         'Topic :: Text Processing',
-    ]
+    ],
 )