code-health: remove utf-8 encoding instruction

Since Python 3 the default encoding of source files is already UTF-8 [1].
Unless instruction says something other than some variation of "utf-8",
it has no effect [2].

1. https://docs.python.org/3/howto/unicode.html#the-string-type
2. https://stackoverflow.com/questions/4872007/where-does-this-come-from-coding-utf-8

Part of #212

Author: DifferentialOrange

doc/conf.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # Tarantool python client library documentation build configuration file, created by
 # sphinx-quickstart on Tue Nov 29 06:29:57 2011.
 #

setup.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-# -*- coding: utf-8 -*-
+
 import codecs
 import os
 import re

tarantool/__init__.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # pylint: disable=C0301,W0105,W0401,W0614
 
 import sys

tarantool/connection.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # pylint: disable=C0301,W0105,W0401,W0614
 '''
 This module provides low-level API for Tarantool

tarantool/connection_pool.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-
 import abc
 import itertools
 import queue

tarantool/const.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # pylint: disable=C0301,W0105,W0401,W0614
 
 IPROTO_CODE = 0x00

tarantool/dbapi.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from tarantool.connection import Connection as BaseConnection
 from tarantool.error import *
 

tarantool/error.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # pylint: disable=C0301,W0105,W0401,W0614
 '''
 Python DB API compatible exceptions

tarantool/mesh_connection.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 '''
 This module provides the MeshConnection class with automatic switch
 between Tarantool instances by the basic round-robin strategy.

tarantool/request.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # pylint: disable=C0301,W0105,W0401,W0614
 '''
 Request types definitions