toString() of enum options: Ensure lowercase

sop-java/src/main/java/sop/enums/ArmorLabel.java

@@ -9,5 +9,11 @@ public enum ArmorLabel {
     Sig,
     Key,
     Cert,
-    Message
+    Message,
+    ;
+
+    @Override
+    public String toString() {
+        return super.toString().toLowerCase();
+    }
 }

sop-java/src/main/java/sop/enums/EncryptAs.java

@@ -6,5 +6,11 @@ package sop.enums;
 
 public enum EncryptAs {
     Binary,
-    Text
+    Text,
+    ;
+
+    @Override
+    public String toString() {
+        return super.toString().toLowerCase();
+    }
 }

sop-java/src/main/java/sop/enums/SignAs.java

@@ -13,5 +13,11 @@ public enum SignAs {
     /**
      * Signature is made over the message in text mode.
      */
-    Text
+    Text,
+    ;
+
+    @Override
+    public String toString() {
+        return super.toString().toLowerCase();
+    }
 }