Update README.md

Author: vhudlikar

Specialized Areas/Regular Expressions/Indian GSTIN Validator/README.md

@@ -80,7 +80,7 @@ The most commonly used Regular Expression (Regex) pattern for GSTIN structural v
 
 - `boolean`: `true` if the string is matches with the given regular expression, `false` otherwise.
 
-## Examples
+### Examples
 
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