Remove line statements from COMPATIBILITY.md (#673)

From what I understand, #503 has implemented line statements already.

Author: evroon

COMPATIBILITY.md

@@ -5,9 +5,8 @@ the state of compatibility and future direction is.
 
 ## Syntax Differences
 
-MiniJinja does not support line statements and custom delimiters are an
-optional feature that is largely discouraged.  For custom delimiters the
-`custom_syntax` feature needs to be enabled.
+Custom delimiters are an optional feature that is largely discouraged. 
+For custom delimiters the `custom_syntax` feature needs to be enabled.
 
 MiniJinja by default does not allow unicode identifiers.  These need to be
 turned on with the `unicode` feature to achieve parity with Jinja2.