Update README.md

Author: fluentfuture

README.md

@@ -183,9 +183,9 @@ String schemeStripped = Substring.first("://").andBefore().removeFrom(uri);
 
 **Example 3: split a string in the format of "name=value" into `name` and `value`:**
 ```java
-Substring eq = Substring.first('=').in(nameValue).orElseThrow(...);
-String name = eq.getBefore();
-String value = eq.getAfter();
+Substring op = Substring.first('=').in(nameValue).orElseThrow(...);
+String name = op.getBefore();
+String value = op.getAfter();
 ```
 
 **Example 4: replace trailing "//" with "/" :**