Make sure only files are hashed

[Sebastian-0]

Without this fix directories with . in the name will be matched and the script will crash when it tries to open them.

In my case we have a project where some of the sources are in the repo's root directory, and then the hashing computation matches the .git folder which is in the same folder.

Obviously this will cause problems for any folders with a dot in the name if it is within the source folder hierarchy.

[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 3.43%.

Quality metrics	Before	After	Change
Complexity	6.88 ⭐	9.26 🙂	2.38 👎
Method Length	64.00 🙂	64.71 🙂	0.71 👎
Working memory	3.50 ⭐	3.44 ⭐	-0.06 👍
Quality	68.31% 🙂	64.88% 🙂	-3.43% 👎

Other metrics	Before	After	Change
Lines	95	96	1

Changed files	Quality Before	Quality After	Quality Change
mkdoxy/doxyrun.py	68.31% 🙂	64.88% 🙂	-3.43% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
mkdoxy/doxyrun.py	DoxygenRun.hasChanged	18 🙂	146 😞		45.77% 😞	Try splitting into smaller methods

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