perf: add support for Palm version (#55)

BREAKING CHANGE: add support for palm

* feat: some configurations have been reverted to the previous version

README.md

@@ -39,8 +39,8 @@ This plugin works with some docker images. These are defined by default
 if you have different images that aren't based on these, you can have some problems.
 
 ```yaml
-DOCKER_IMAGE_OPENEDX: "docker.io/ednxops/distro-edunext-edxapp:olmo"
-DOCKER_IMAGE_OPENEDX_DEV: "docker.io/ednxops/distro-edunext-edxapp-dev:olmo"
+DOCKER_IMAGE_OPENEDX: "docker.io/ednxops/distro-edunext-edxapp:palma"
+DOCKER_IMAGE_OPENEDX_DEV: "docker.io/ednxops/distro-edunext-edxapp-dev:palma"
 ```
 
 Also, you need an edx-platform version distro compatible.
@@ -51,14 +51,15 @@ Also, you need an edx-platform version distro compatible.
 | maple   | mango    | v13   |
 | nutmeg  | nuez     | v14   |
 | olive   | olmo     | v15   |
+| palm    | palma    | v16   |
 
 :warning: **NOTE**: From Olmo version Distro has not defaulted packages. Now it is necessary to add the packages you want in ``config.yml`` file. See [How to add a new package](./docs/how_to_add_new_packages.rst)
 
 You can find distro releases on https://github.com/edunext/edunext-platform.
 
 ```yaml
 EDX_PLATFORM_REPOSITORY: "https://github.com/eduNEXT/edunext-platform.git"
-EDX_PLATFORM_VERSION: "ednx-release/olmo.master"
+EDX_PLATFORM_VERSION: "ednx-release/palma.master"
 ```
 
 # Packages

setup.py

@@ -38,8 +38,8 @@ def load_about():
     long_description=load_readme(),
     packages=find_packages(exclude=["tests*"]),
     include_package_data=True,
-    python_requires=">=3.6",
-    install_requires=["tutor>=15.0.0, <16", "click", "schema"],
+    python_requires=">=3.8",
+    install_requires=["tutor>=16.0.0, <17", "click", "schema"],
     extras_require={
             "test": ["behave", "pytest", "pylint", "pytest-mock", "pycodestyle", "isort", "schema"]
         },