Don't define version for sources (will be part of frictionless)

[peterdesmet]

Frictionless has a suggested PR (frictionlessdata/datapackage#10) that will add version to sources. If accepted, we no longer need to define it in Camtrap DP:

camtrap-dp/camtrap-dp-profile.json

Lines 139 to 147 in 188d285

	"items": {
	"properties": {
	"version": {
	"description": "Version of the source.",
	"type": "string"
	}
	}
	}
	},