Fix driver version string

Author: Anil Kumar

tests/ext/pymysql/test_pymysql.py

@@ -47,7 +47,7 @@ def test_execute_dsn_kwargs():
     sql = subsegment.sql
     assert sql['database_type'] == 'MySQL'
     assert sql['user'] == dsn['user']
-    assert sql['driver_version'] == 'PyMySql'
+    assert sql['driver_version'] == 'PyMySQL'
     assert sql['database_version']
 
 
@@ -72,7 +72,7 @@ def test_execute_bad_query():
     sql = subsegment.sql
     assert sql['database_type'] == 'MySQL'
     assert sql['user'] == dsn['user']
-    assert sql['driver_version'] == 'PyMySql'
+    assert sql['driver_version'] == 'PyMySQL'
     assert sql['database_version']
 
     exception = subsegment.cause['exceptions'][0]