Package-Dependency: Do not limit python-can package to be version < 4

* It looks like PyTrinamic works fine with the latest python-can version
* Tested with tests\test_can_adapters.py
* This is expected to fix #106

setup.py

@@ -17,7 +17,7 @@
     packages=setuptools.find_packages(),
     include_package_data=True,
     install_requires=[
-        "python-can>=3,<4",
+        "python-can>=3",
         "canopen",
         "pyserial>=3"
     ],