Bump2version

It's used only as a dev dependency in 5 crates.

Depender (with downloads and own rev deps)			Bump2version version
160	1	emitter-rs	dev	^0.1.3
		rping	dev	^0.1.3
		ipcap	dev	^0.1.3
	1	gems	dev	^0.1.2
		openbook	dev	^0.1.3