Add licensing info

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

rust-hyperfine.spec

@@ -28,6 +28,13 @@ Command-line benchmarking tool.}
 
 %package     -n %{crate}
 Summary:        %{summary}
+# Install all deps (without check), grab their licenses and make it simple
+# * ASL 2.0 or Boost
+# * ASL 2.0 or MIT
+# * MIT
+# * MIT or ASL 2.0
+# * MPLv2.0
+# * Unlicense or MIT
 License:        ASL 2.0 and MIT and MPLv2.0
 
 %description -n %{crate} %{_description}