Added "yield from" to the list of lowercase keywords + test

Author: michalbundyra

src/Standards/Generic/Sniffs/PHP/LowerCaseKeywordSniff.php

@@ -94,6 +94,7 @@ public function register()
                 T_VAR,
                 T_WHILE,
                 T_YIELD,
+                T_YIELD_FROM,
                );
 
     }//end register()

src/Standards/Generic/Tests/PHP/LowerCaseKeywordUnitTest.inc

@@ -18,6 +18,7 @@ const PRIVATE;
 HttpStatus::CONTINUE;
 Function ($f) {
     Yield $f;
+    Yield From fun();
 }
 class X extends Y {
     public function m() {

src/Standards/Generic/Tests/PHP/LowerCaseKeywordUnitTest.inc.fixed

@@ -18,6 +18,7 @@ const PRIVATE;
 HttpStatus::CONTINUE;
 function ($f) {
     yield $f;
+    yield from fun();
 }
 class X extends Y {
     public function m() {

src/Standards/Generic/Tests/PHP/LowerCaseKeywordUnitTest.php

@@ -35,8 +35,9 @@ public function getErrorList()
                 16 => 1,
                 19 => 1,
                 20 => 1,
-                24 => 1,
-                27 => 1,
+                21 => 1,
+                25 => 1,
+                28 => 1,
                );
 
     }//end getErrorList()