replace backtrace with rich

requirements/development.txt

@@ -14,11 +14,10 @@ pudb
 # https://pypi.org/project/q/
 q
 
-# backtrace manipulates Python tracebacks to make them more
-# readable. It provides different configuration options for
-# coloring and formatting.
+# rich is used for more readable tracebacks during development
 # https://github.com/nir0s/backtrace
-backtrace
+# https://rich.readthedocs.io/en/latest/traceback.html
+rich
 
 # Py-Spy: A sampling profiler for Python programs.
 # https://github.com/benfred/py-spy

src/pycalver/cli.py

@@ -26,13 +26,14 @@ _VERBOSE = 0
 
 
 # To enable pretty tracebacks:
-#   echo "export ENABLE_BACKTRACE=1;" >> ~/.bashrc
-if os.environ.get('ENABLE_BACKTRACE') == '1':
+#   echo "export ENABLE_RICH_TB=1;" >> ~/.bashrc
+if os.environ.get('ENABLE_RICH_TB') == '1':
     try:
-        import backtrace
+        import rich.traceback
 
-        backtrace.hook(align=True, strip_path=True, enable_on_envvar_only=True)
+        rich.traceback.install()
     except ImportError:
+        # don't fail just because of missing dev library
         pass