add support for converting to WKT to EPSG #588

Job	Run time
Documentation	5m 21s
Julia 1.6 - ubuntu-latest - x64 - pull_request	3m 24s
Julia 1.6 - macOS-latest - x64 - pull_request	6m 28s
Julia 1.6 - windows-latest - x64 - pull_request	10m 42s
Julia 1 - ubuntu-latest - x64 - pull_request	3m 19s
Julia 1 - macOS-latest - x64 - pull_request	4m 39s
Julia 1 - windows-latest - x64 - pull_request	4m 54s
Julia nightly - ubuntu-latest - x64 - pull_request	4m 26s
Julia nightly - macOS-latest - x64 - pull_request	5m 16s
Julia nightly - windows-latest - x64 - pull_request	6m 45s
	55m 14s

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