Bump version `3.0.1+dev` to `3.0.1-a.0` #311

Job	Run time
version / Parse Version	9s
⚡ Package web app	6m 4s
electron-snap	12m 28s
🏁 Windows: ⚡ Package electron	21m 58s
🍎 macOS: ⚡ Package electron	14m 54s
🐧 AppImage 4 Linux: ⚡ Package electron	6m 19s
	1h 1m 52s

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