Correct spelling mistakes

README.rst

@@ -82,7 +82,7 @@ Context Manager
     >>> from sqlitedict import SqliteDict
     >>>
     >>> # The database is automatically closed when leaving the with section.
-    >>> # Uncommited objects are not saved on close. REMEMBER TO COMMIT!
+    >>> # Uncommitted objects are not saved on close. REMEMBER TO COMMIT!
     >>>
     >>> with SqliteDict("example.sqlite") as db:
     ...     print("There are %d items in the database" % len(db))

tests/test_core.py

@@ -140,7 +140,7 @@ def attempt_terminate():
 
     def test_readonly_table(self):
         """
-        Read-only access on a non-existant tablename should raise RuntimeError,
+        Read-only access on a non-existent tablename should raise RuntimeError,
         and not create a new (empty) table.
         """
         fname = norm_file('tests/db/sqlitedict-override-test.sqlite')