rename the BINDING environment variable to QT_API

.appveyor.yml

@@ -3,45 +3,44 @@ image: Visual Studio 2019
 environment:
   matrix:
     - PYTHON: C:\Python35
-      BINDING: PyQt5
+      QT_API: PyQt5
     - PYTHON: C:\Python35-x64
-      BINDING: PySide2
+      QT_API: PySide2
     - PYTHON: C:\Python36
-      BINDING: PyQt6
+      QT_API: PyQt6
     - PYTHON: C:\Python36-x64
-      BINDING: PySide6
+      QT_API: PySide6
     - PYTHON: C:\Python37
-      BINDING: PyQt6
+      QT_API: PyQt6
     - PYTHON: C:\Python37-x64
-      BINDING: PySide6
+      QT_API: PySide6
     - PYTHON: C:\Python38
-      BINDING: PyQt6
+      QT_API: PyQt6
     - PYTHON: C:\Python38-x64
-      BINDING: PySide6
+      QT_API: PySide6
     - PYTHON: C:\Python39
+      QT_API: PySide6
       CLONE_PYTHONNET: "true"
     - PYTHON: C:\Python39-x64
+      QT_API: PySide6
       CLONE_PYTHONNET: "true"
     - PYTHON: C:\Python39-x64
+      QT_API: PyQt6
       CLONE_PYTHONNET: "true"
-      BINDING: PySide6
     - PYTHON: C:\Python39-x64
+      QT_API: PySide2
       CLONE_PYTHONNET: "true"
-      BINDING: PyQt6
     - PYTHON: C:\Python39-x64
+      QT_API: PyQt5
       CLONE_PYTHONNET: "true"
-      BINDING: PySide2
-    - PYTHON: C:\Python39-x64
-      CLONE_PYTHONNET: "true"
-      BINDING: PyQt5
 
 install:
   - set PATH=%PYTHON%;%PYTHON%\Scripts;%PATH%
   - python --version
   - python -m pip install --upgrade pip
   - python -m pip install --upgrade setuptools wheel
   - python -m pip install --upgrade pytest pytest-cov pytest-runner
-  - python -m pip install %BINDING%
+  - python -m pip install %QT_API%
   - IF "%CLONE_PYTHONNET%"=="true" (
       python -m pip install --upgrade pycparser &&
       python -m pip install git+https://github.com/pythonnet/pythonnet.git

.travis.yml

@@ -9,43 +9,43 @@ jobs:
   include:
     - os: linux
       python: 3.5
-      env: BINDING=PySide2
+      env: QT_API=PySide2
     - os: linux
       python: 3.6
-      env: BINDING=PySide6
+      env: QT_API=PySide6
     - os: linux
       python: 3.7
-      env: BINDING=PySide6
+      env: QT_API=PySide6
     - os: linux
       python: 3.8
-      env: BINDING=PySide6
+      env: QT_API=PySide6
     - os: linux
       python: 3.9
-      env: BINDING=PySide6
+      env: QT_API=PySide6
     - os: linux
       python: 3.9
-      env: BINDING=PySide2
+      env: QT_API=PySide2
     - os: linux
       python: 3.9
-      env: BINDING=PyQt6
+      env: QT_API=PyQt6
     - os: linux
       python: 3.9
-      env: BINDING=PyQt5
+      env: QT_API=PyQt5
     - os: osx
       language: shell
-      env: PYTHON=3.5.10 BINDING=PySide2
+      env: PYTHON=3.5.10 QT_API=PySide2
     - os: osx
       language: shell
-      env: PYTHON=3.6.12 BINDING=PySide6
+      env: PYTHON=3.6.12 QT_API=PySide6
     - os: osx
       language: shell
-      env: PYTHON=3.7.9 BINDING=PySide6
+      env: PYTHON=3.7.9 QT_API=PySide6
     - os: osx
       language: shell
-      env: PYTHON=3.8.6 BINDING=PySide6
+      env: PYTHON=3.8.6 QT_API=PySide6
     - os: osx
       language: shell
-      env: PYTHON=3.9.0 BINDING=PySide6
+      env: PYTHON=3.9.0 QT_API=PySide6
 
 before_install:
   - |
@@ -74,7 +74,7 @@ install:
   - python -m pip install --upgrade pip
   - python -m pip install --upgrade setuptools wheel
   - python -m pip install --upgrade pytest pytest-cov pytest-runner
-  - python -m pip install --upgrade $BINDING
+  - python -m pip install --upgrade $QT_API
   - python -m pip list
 
 before_script: