Support Python 3.9 release in build instead of using 3.9 beta

.travis.yml

@@ -108,37 +108,20 @@ jobs:
         <<: *env_windows
         JRNL_PYTHON_VERSION: 3.8.2
 
-    # Python 3.9 Dev Tests
+    # Python 3.9 Tests
     - name: Python 3.9 on Linux
-      before_install:
-        - pip install toml
-        - python .build/allow_all_python_version.py
-      python: 3.9-dev
+      python: 3.9
     - <<: *test_mac
       name: Python 3.9 on MacOS
-      before_install:
-        - brew upgrade pyenv
-        - eval "$(pyenv init -)"
-        - pyenv install -s $JRNL_PYTHON_VERSION
-        - pyenv global $JRNL_PYTHON_VERSION
-        - pip install --upgrade pip
-        - pip --version
-        - pip install toml
-        - python .build/allow_all_python_version.py
+      python: 3.9
       env:
-        JRNL_PYTHON_VERSION: 3.9.0b5
+        JRNL_PYTHON_VERSION: 3.9.0
     - <<: *test_windows
       name: Python 3.9 on Windows
-      before_install:
-        - choco install python --pre
-        - python --version
-        - python -m pip install --upgrade pip
-        - pip --version
-        - pip install toml
-        - python .build/allow_all_python_version.py
+      python: 3.9
       env:
         <<: *env_windows
-        JRNL_PYTHON_VERSION: 3.9.0b5
+        JRNL_PYTHON_VERSION: 3.9.0
 
     # ... and beyond!
     - name: Python nightly on Linux

pyproject.toml

@@ -16,7 +16,7 @@ homepage = "https://jrnl.sh"
 repository = "https://github.com/jrnl-org/jrnl"
 
 [tool.poetry.dependencies]
-python = ">=3.7.0, <3.9.0"
+python = ">=3.7.0, <3.10.0"
 pyxdg = "^0.26.0"
 cryptography = "^3.0"
 passlib = "^1.7"