MLBEDSW-6518: Change to Python 3.7

This commit downgrades the required Python version
to 3.7 from 3.8.

Signed-off-by: Dwight Lidman <dwight.lidman@arm.com>
Change-Id: I07057908b97bcd94663f001474d877ba41411ae1
diff --git a/README.md b/README.md
index 051ebf3..eb8871e 100644
--- a/README.md
+++ b/README.md
@@ -44,9 +44,9 @@
 
 The following should be installed prior to the installation of Vela:
 
-* Python 3.8 or compatible
+* Python 3.7 or compatible
    - Development version containing the Python/C API header files
-   - e.g. `apt install python3.8-dev` or `yum install python38-devel`
+   - e.g. `apt install python3.7-dev` or `yum install python37-devel`
 * Pip3
 * A C99 capable compiler and associated toolchain
     - For Linux operating systems, a GNU toolchain is recommended.
diff --git a/setup.py b/setup.py
index ef88f75..244fc4e 100644
--- a/setup.py
+++ b/setup.py
@@ -77,7 +77,7 @@
         "Operating System :: Microsoft :: Windows :: Windows 10",
         "Programming Language :: C",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.7",
         "Topic :: Scientific/Engineering :: Artificial Intelligence",
         "Topic :: Software Development :: Compilers",
     ],
@@ -89,7 +89,7 @@
         "ethosu.vela.tosa",
         "ethosu.mlw_codec",
     ],
-    python_requires="~=3.8",
+    python_requires="~=3.7",
     install_requires=[
         "flatbuffers==1.12.0",
         "numpy",