Add missing __Override attributes

Author: fredemmott

src/CodegenClassConstant.php

@@ -58,6 +58,7 @@ public function setTypef(
     return $this->setType(\vsprintf($format, $args));
   }
 
+  <<__Override>>
   public function appendToBuilder(HackBuilder $builder): HackBuilder {
     $value = $this->getValue();
     $abstract = $this->isAbstract();

src/CodegenConstant.php

@@ -49,6 +49,7 @@ public function setTypef(
 		return $this->setType(\vsprintf($format, $args));
 	}
 
+  <<__Override>>
   public function appendToBuilder(HackBuilder $builder): HackBuilder {
     $value = $this->getValue();
     invariant($value !== null, 'constants must have a value');

src/CodegenTypeConstant.php

@@ -58,6 +58,7 @@ public function setConstraintf(
     return $this;
   }
 
+  <<__Override>>
   public function appendToBuilder(HackBuilder $builder): HackBuilder {
     $value = $this->getValue();
     $abstract = $this->isAbstract();