Fix tox failures

Author: richvdh

MANIFEST.in

@@ -1,3 +1,4 @@
+prune .idea
 include *.in
 include *.py
 include tests/*.py

signedjson/sign.py

@@ -97,14 +97,14 @@ def verify_signed_json(json_object, signature_name, verify_key):
 
     try:
         signature_b64 = signatures[signature_name][key_id]
-    except:
+    except KeyError:
         raise SignatureVerifyException(
             "Missing signature for %s, %s" % (signature_name, key_id)
         )
 
     try:
         signature = decode_base64(signature_b64)
-    except:
+    except Exception:
         raise SignatureVerifyException(
             "Invalid signature base64 for %s, %s" % (signature_name, key_id)
         )
@@ -119,8 +119,7 @@ def verify_signed_json(json_object, signature_name, verify_key):
 
     try:
         verify_key.verify(message, signature)
-    except:
-        logger.exception("Error verifying signature")
+    except Exception as e:
         raise SignatureVerifyException(
-            "Unable to verify signature for %s " % signature_name
+            "Unable to verify signature for %s: %s %s" % (signature_name, type(e), e)
         )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = packaging, pep8, py3pep8, py27, py33, py34, pypy
+envlist = packaging, pep8, py3pep8, py27, py33, py34, py35, py36, py37, py38, pypy
 
 [testenv]
 deps =
@@ -19,10 +19,10 @@ commands = check-manifest
 basepython = python2.7
 deps =
     flake8
-commands = flake8 .
+commands = flake8 signedjson tests setup.py
 
 [testenv:py3pep8]
-basepython = python3.4
+basepython = python3.7
 deps =
     flake8
-commands = flake8 .
+commands = flake8 signedjson tests setup.py