Source Pim version control doesn't allow version string like ^1.7

[bpresles]

The source Pim version check verify that the version string on composer.json container the "1.7." string.

But when the version string is like "^1.7", which means ">= 1.7 < 2.0" and so is perfectly valid, because it confirms that the source pim is a 1.7.x version, the check doesn't work because it doesn't contain a 1.7.* version string.

This check should allow ^1.7 or ~1.7 as source pim version, that's why it should only check for "1.7"