Release 19.1: Add context.is_executable() shortcut

Author: xolox

executor/__init__.py

@@ -3,7 +3,7 @@
 # Programmer friendly subprocess wrapper.
 #
 # Author: Peter Odding <peter@peterodding.com>
-# Last Change: February 25, 2018
+# Last Change: March 25, 2018
 # URL: https://executor.readthedocs.io
 
 """
@@ -68,7 +68,7 @@
 from executor.process import ControllableProcess
 
 # Semi-standard module versioning.
-__version__ = '19.0'
+__version__ = '19.1'
 
 # Initialize a logger.
 logger = logging.getLogger(__name__)