Update README.md

Author: sweetStreet

README.md

@@ -1,6 +1,7 @@
 # pytest-inline
 
 pytest-inline is a plugin for [pytest](<http://pytest.org>) that writes inline tests.
+inline tests is a new kind of tests that make it easier to check individual program statements. An inline test is a statement that allows to provide arbitrary inputs and test oracles for checking the immediately preceding statement that is not an inline test.
 
 
 ## Table of contents