README.md in metaheader-1.1.1 vs README.md in metaheader-1.2

@@ -12,10 +12,14 @@
 @key
   value line 1
   value line 2
 
 @key
+@key true
+
+@nokey
+@key false
 ```
 
 Any kind of comment syntax or prefix can be used:
 
 ```cpp
@@ -48,12 +52,13 @@
 
 # set @key as mandatory
 errors = mh.validate key: MetaHeader::REQUIRED
 
 # other validators are available:
+# mh.validate key: MetaHeader::BOOLEAN
 # mh.validate key: MetaHeader::OPTIONAL
 # mh.validate key: MetaHeader::SINGLELINE
-# mh.validate key: MetaHeader::HAS_VALUE
+# mh.validate key: MetaHeader::VALUE
 # mh.validate key: /^\w{2,}$/
 # mh.validate key: proc {|value| 'return nil or error' }
 
 value = mh[:key]
 ```