Minor improvements and dependency upgrades

Full Changelog: v0.20.2...v0.20.3

Minor improvements and dependency upgrades

v0.20.2

Upgrade some dependencies

Upgraded dependencies

• Upgrade dependencies

Multiple windows and signed app bundle

• Added screenshot to README
• Show branch combobox tooltip
• Include build timestamp in resources
• Check for updates of Gitover by getting github repo releases
• Add menu item to start a new instance of Gitover
• Upgrade dependencies
• Introduce code signing of app ( to support running under MacOS Catalina )
• Build dmg image from application bundle

Improved background tasks

• Upgrade dependencies: gitpython==3.0.1, pyinstaller==3.5, pyqt5==5.13.0, pyyaml==5.1.2
• Repo can be removed from UI via menu command or shortcut
• Include git rev in version when HEAD is not the tagged version
• Use pip-tools to manage requirements
• Use YAML SafeLoader
• Force utf-8 encoding when reading whole file for diff'ing
• Double check that _func attribute is available on WorkerRunnable
• Add scrollbar to commit list
• Show trunk/tracking ahead/behind in dedicated tabs
• Show commit history as list
• Only show "..." badge when there is no other action active
• Fix wrong argument type for sleeping
• Filter environment variables used to start tool

Known issues:
QML renderer seems to hang/stuck when app is run while system goes to sleep ( e.g. over night ).
UI seems to handle menu commands and shortcuts but QML UI is not re-rendered and appears stuck.
Workaround by manually open the About-Dialog via menu.

v0.19.0

• Showing commit tags in commit details
• Optionally use fswatch to track filesystem changes
• Refactored background tasks to add repos and get commit details
• Renamed commandline option --timing to --detailed-log

v0.18.3

• Use newer GitPython (2.1.11)
• Use newer PyQt5 (5.11.2)
• Show action badge when remote URL was found in push output

v0.18.1

Use less resources ( file/pipe handles ) to allow tracking many/huge repositories.

v0.18.0

Various bugfixes and minor improvements.
Build is now based on Python 3.6.4 and PyQt5 5.10.1.