drop python 3.7 support

Author: sbSteveK

README.md

@@ -18,7 +18,7 @@ This document provides information about the AWS IoT Device SDK v2 for Python. T
 ## Installation
 
 ### Minimum Requirements
-* Python 3.7+
+* Python 3.8+
 
 [Step-by-step instructions](./documents/PREREQUISITES.md)
 

builder.json

@@ -43,11 +43,6 @@
                 ["/opt/python/cp38-cp38/bin/python", "-m", "pip", "install", ".", "--verbose"],
                 ["/opt/python/cp38-cp38/bin/python", "-m", "pip", "install", "boto3", "autopep8"],
                 ["/opt/python/cp38-cp38/bin/python", "-m", "unittest", "discover", "--verbose"],
-                ["echo", "------ Python 3.7 ------"],
-                ["/opt/python/cp37-cp37m/bin/python", "-m", "pip", "install", "--upgrade", "pip", "setuptools"],
-                ["/opt/python/cp37-cp37m/bin/python", "-m", "pip", "install", ".", "--verbose"],
-                ["/opt/python/cp37-cp37m/bin/python", "-m", "pip", "install", "boto3", "autopep8"],
-                ["/opt/python/cp37-cp37m/bin/python", "-m", "unittest", "discover", "--verbose"]
             ],
             "run_tests": false,
             "_comment": "manylinux has all its own build steps, turn off 'tests' which is where normal build steps are declared. using data to program sucks"

documents/PREREQUISITES.md

@@ -1,6 +1,6 @@
 # PREREQUISITES
 
-## Python 3.7 or higher
+## Python 3.8 or higher
 
 How you install Python varies from platform to platform. Below are the instructions for Windows, MacOS, and Linux:
 

setup.py

@@ -42,5 +42,5 @@ def _load_version():
     install_requires=[
         'awscrt==0.27.4',
     ],
-    python_requires='>=3.7',
+    python_requires='>=3.8',
 )