Merge pull request #15 from marco-neumann-jdas/fix_license_metadata

use a machine-readable license key

Cargo.toml

@@ -5,7 +5,7 @@ authors = ["Adam Wick <awick@uhsure.com>"]
 description = "A simple DER/ASN.1 encoding/decoding library."
 categories = ["encoding"]
 keywords = ["ASN1","encoding","DER"]
-license-file = "LICENSE"
+license = "ISC"
 repository = "https://github.com/acw/simple_asn1"
 
 [dependencies]