Add SPDX headers

Author: makermelissa

.github/release-drafter.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2023 Melissa LeBlanc-Williams, written for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
 categories:
   - title: "New Boards"
     collapse-after: 1
@@ -11,4 +15,4 @@ template: |
 
   To use in CPython, `pip3 install Adafruit-PlatformDetect`.
 
-  Read the [docs](https://circuitpython.readthedocs.io/projects/platformdetect/en/latest/) for info on how to use it.
+  Read the [docs](https://circuitpython.readthedocs.io/projects/platformdetect/en/latest/) for info on how to use it.

.github/workflows/release-drafter.yml

@@ -1,3 +1,7 @@
+# SPDX-FileCopyrightText: 2023 Melissa LeBlanc-Williams, written for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
 name: Release Drafter
 
 on:
@@ -18,4 +22,4 @@ jobs:
     steps:
       - uses: release-drafter/release-drafter@v5
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}