Fix TypeError

can only concatenate str (not "bytes") to str

Author: linchiwei123

changelog/5782.bugfix.rst

@@ -0,0 +1 @@
+Fix decoding error when printing an error response from ``--pastebin``.

src/_pytest/pastebin.py

@@ -72,7 +72,7 @@ def create_new_paste(contents):
     if m:
         return "{}/show/{}".format(url, m.group(1))
     else:
-        return "bad response: " + response
+        return "bad response: " + response.decode("utf-8")
 
 
 def pytest_terminal_summary(terminalreporter):