fix minor typo (#1991)

close #1990

patroni/ha.py

@@ -1002,7 +1002,7 @@ class Ha(object):
                 else:
                     return self.enforce_master_role(
                         'no action. I am ({0}) the leader with the lock'.format(self.state_handler.name),
-                        'promoted self to leader because i had the session lock'
+                        'promoted self to leader because I had the session lock'
                     )
             else:
                 # Either there is no connection to DCS or someone else acquired the lock

tests/test_ha.py

@@ -300,7 +300,7 @@ class TestHa(PostgresInit):
         self.p.is_healthy = true
         self.ha.has_lock = true
         self.p.controldata = lambda: {'Database cluster state': 'in production', 'Database system identifier': SYSID}
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader because i had the session lock')
+        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader because I had the session lock')
 
     @patch('psycopg2.connect', psycopg2_connect)
     def test_acquire_lock_as_master(self):
@@ -354,7 +354,7 @@ class TestHa(PostgresInit):
         self.ha.cluster.is_unlocked = false
         self.ha.has_lock = true
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader because i had the session lock')
+        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader because I had the session lock')
 
     def test_promote_without_watchdog(self):
         self.ha.cluster.is_unlocked = false