Apply suggestion to src/pregmod/incubator.tw

src/pregmod/incubator.tw

@@ -453,7 +453,7 @@ Target age for release: <<textbox "$targetAge" $targetAge "Incubator">> [[Minimu
 				<<elseif _safecc > 30000>>
 					$His belly looks like it contains full sized twins, ready to be birthed.
 				<<elseif _safecc > 15000>>
-					$His belly reached size of full term pregnancy.
+					$His belly has reached the size of full term pregnancy.
 				<<elseif _safecc > 10000>>
 					$His belly inflated to the late term pregnancy size, skin become shiny.
 				<<elseif _safecc > 5000>>