[requires.io] dependency update on master branch

requirements-test.txt

@@ -1,6 +1,6 @@
 # test runs requirements (versions we'll be testing against) - automatically updated by requires.io
 coverage==4.4.1 # pytest-cov
-pylama==7.3.3
+pylama==7.4.1
 pyflakes==1.5.0
 pydocstyle==2.0.0
 pycodestyle==2.3.1

setup.py

@@ -44,7 +44,7 @@ def read(fname):
 
 test_requires = [
     'pytest-cov==2.5.1',
-    'pytest-xdist==1.17.1',
+    'pytest-xdist==1.18.0',
 ]
 
 extras_require = {

src/pytest_dynamodb/port.py

@@ -25,11 +25,11 @@ class InvalidPortsDefinition(ValueError):
     """Exception raised if ports definition is not a valid string."""
 
     def __init__(self, ports):
-        """Constructor for InvalidPortsDefinition exception."""
+        """Construct InvalidPortsDefinition exception."""
         self.ports = ports
 
     def __str__(self):
-        """String representation."""
+        """Return string representation."""
         return (
             'Unknown format of ports: {0}.\n'
             'You should provide a ports range "[(4000,5000)]"'