[README.md] typo fix

Author: chrissimpkins

README.md

@@ -8,7 +8,7 @@
 
 Path Inspector is a TTF font curve path inspection application.  The Python package installs the `pathins` command line executable and requires a Python v3.6+ interpreter.
 
-The following sub-commands available:
+The following sub-commands are available:
 
 - `coordinates`: path coordinates report (as of v0.3.0)
 - `direction`: outermost contour path direction report (as of v0.2.0)