Cleanup makefile. Document fetch

Makefile

@@ -25,7 +25,9 @@ verify: test-image
 		local/sig-test /bin/bash -c " \
 			cp -R sig /tmp/sig; \
 			cd /tmp/sig; \
-		./sig fetch --group maintainers 6B61ECD76088748C70590D55E90A401336C8AAA9; \
+			./sig fetch \
+				--group maintainers \
+				6B61ECD76088748C70590D55E90A401336C8AAA9; \
 			./sig verify --threshold 1 --method=git --group maintainers; \
 			./sig verify --threshold 3 --method=detached --group maintainers; \
 		"

README.md

@@ -58,6 +58,8 @@ The simple GPG signature toolchain for directories or git repos.
   * Add signature to manifest for this directory
 * sig manifest
   * Generate hash manifest for this directory
+* sig fetch [-g,--group=<group>]
+  * Fetch key by fingerprint. Optionally add to group.
 * sig help
   * Show help text.
 * sig version