removed the dot on the pytest command

removed the dot on the pytest command on  the README.md

README.md

@@ -14,7 +14,7 @@ Motivation
 
 Whether or not you use the test-driven development method, running tests
 continuously is far more productive than waiting until you're finished
-programming to test your code. Additionally, manually running `py.test` each
+programming to test your code. Additionally, manually running `pytest` each
 time you want to see if any tests were broken has more wait-time and cognitive
 overhead than merely listening for a notification. This could be a crucial
 difference when debugging a complex problem or on a tight deadline.
@@ -69,27 +69,27 @@ $ ptw --beforerun init_db.py
 ```
 
 Or after they finish, e.g. deleting a sqlite file. Note that this script receives
-the exit code of `py.test` as an argument.
+the exit code of `pytest` as an argument.
 
 ```bash
 $ ptw --afterrun cleanup_db.py
 ```
 
-You can also use a custom runner script for full `py.test` control:
+You can also use a custom runner script for full `pytest` control:
 
 ```bash
 $ ptw --runner "python custom_pytest_runner.py"
 ```
 
-Here's an minimal runner script that runs `py.test` and prints its exit code:
+Here's an minimal runner script that runs `pytest` and prints its exit code:
 
 ```py
 # custom_pytest_runner.py
 
 import sys
 import pytest
 
-print('py.test exited with code:', pytest.main(sys.argv[1:]))
+print('pytest exited with code:', pytest.main(sys.argv[1:]))
 ```
 
 Need to exclude directories from being observed or collected for tests?
@@ -118,11 +118,11 @@ Options:
                         Otherwise, tests are interrupted on filesystem events.
   --beforerun <cmd>     Run arbitrary command before tests are run.
   --afterrun <cmd>      Run arbitrary command on completion or interruption.
-                        The exit code of "py.test" is passed as an argument.
+                        The exit code of "pytest" is passed as an argument.
   --onpass <cmd>        Run arbitrary command on pass.
   --onfail <cmd>        Run arbitrary command on failure.
   --onexit <cmd>        Run arbitrary command when exiting pytest-watch.
-  --runner <cmd>        Run a custom command instead of "py.test".
+  --runner <cmd>        Run a custom command instead of "pytest".
   --pdb                 Start the interactive Python debugger on errors.
                         This also enables --wait to prevent pdb interruption.
   --spool <delay>       Re-run after a delay (in milliseconds), allowing for
@@ -161,7 +161,7 @@ Alternatives
   options). This instead re-runs only those tests which have failed until you
   make them pass. This can be a speed advantage when trying to get all tests
   passing, but leaves out the discovery of new failures until then. It also
-  drops the colors outputted by py.test, whereas pytest-watch doesn't.
+  drops the colors outputted by pytest, whereas pytest-watch doesn't.
 - [Nosey][] is the original codebase this was forked from. Nosey runs [nose][]
   instead of pytest.