Add back 3.6 support

Author: oschwald

.travis.yml

@@ -1,13 +1,11 @@
 language: python
 matrix:
   include:
+    - python: 3.6
     - python: 3.7
-      dist: xenial
     - python: 3.8
-      dist: xenial
       env: RUN_LINTER=1
     - python: nightly
-      dist: xenial
   allow_failures:
     - python: nightly
 

HISTORY.rst

@@ -6,7 +6,7 @@ History
 2.0.0
 ++++++++++++++++++
 
-* IMPORTANT: Python 3.7 or greater is required. If you are using an older
+* IMPORTANT: Python 3.6 or greater is required. If you are using an older
   version, please use a 1.x.x release.
 * Type hints have been added to the pure Python implementation.
 

README.rst

@@ -93,7 +93,7 @@ invalid IP address or an IPv6 address in an IPv4 database.
 Requirements
 ------------
 
-This code requires Python 3.7+. Older versions are not supported. The C
+This code requires Python 3.6+. Older versions are not supported. The C
 extension requires CPython.
 
 Versioning

maxminddb/reader.py

@@ -5,8 +5,6 @@
 This module contains the pure Python database reader and related classes.
 
 """
-from __future__ import annotations
-
 try:
     import mmap
 except ImportError:
@@ -109,7 +107,7 @@ def __init__(
         )
         self.closed = False
 
-    def metadata(self) -> Metadata:
+    def metadata(self) -> "Metadata":
         """Return the metadata associated with the MaxMind DB file"""
         return self._metadata
 
@@ -234,7 +232,7 @@ def close(self) -> None:
     def __exit__(self, *args) -> None:
         self.close()
 
-    def __enter__(self) -> Reader:
+    def __enter__(self) -> "Reader":
         if self.closed:
             raise ValueError("Attempt to reopen a closed MaxMind DB")
         return self