Fixed crash if used with normal pipe

If one wants to run i3status as a subprocess of
i3pystatus, do it like this:

import subprocess
import io
...
process = subprocess.Popen(["i3status", "-c", "~/.i3/status"], stdout=subprocess.PIPE)
stdin = io.TextIOWrapper(process.stdout)
status = I3statusHandler(stdin)

i3pystatus/__init__.py

@@ -60,7 +60,7 @@ class IOHandler:
         Raises EOFError if the end of stream has been reached"""
 
         try:
-            line = self.inp.readline().decode("utf-8").strip()
+            line = self.inp.readline().strip()
         except KeyboardInterrupt:
             raise EOFError()