added more stuff to the README

README.textile

@@ -6,6 +6,7 @@ See http://semver.org/ for details about semantic versioning.
 
 h1. Documentation
 
+``` lua
     local v = require 'semver'
 
     -- accepts integers and numbers
@@ -17,7 +18,29 @@ h1. Documentation
     v2_5_1.minor -- 5
     v2_5_1.patch -- 1
 
-    -- 
+    -- also accepts prerelease/build parameters:
+    a = v(1,0,0,'-alpha')
+    a.prerelease -- 'alpha'
+
+    b = v'0.9.5+no.extensions.22'
+    b.build -- 'no.extensions.22'
+
+    -- comparison & sorting
+    v'1.2.3' == v(1,2,3) -- true
+    v'1.2.3' < v(4,5,6)  -- true
+
+    -- "pessimistic upgrade" operator: ^
+    -- a ^ b returns true if it's safe to update from a to b
+    v'2.0.1' ^ v'2.5.1' -- true - it's safe to upgrade from 2.0.1 to 2.5.1
+    v'1.0.0' ^ v'2.0.0' -- false - 2.0.0 is not supposed to be backwards-compatible
+    v'2.5.1' ^ v'2.0.1' -- false - 2.5.1 is more modern than 2.0.1.
+
+    -- bumping
+    v(1,0,0):nextPatch() -- v1.0.1
+    v(1,2,3):nextMinor() -- v1.3.0 . Notice the patch resets to 0
+    v(1,2,3):nextMajor() -- v2.0.0 . Minor and patch are reset to 0
+
+```
 
 
 h1. Installation