updated for version 7.3.288

Problem:    has('python') may give an error message for not being able to load
            the library after using python3.
Solution:   Only give the error when the verbose argument is true.

src/if_python.c

@@ -368,7 +368,8 @@ python_runtime_link_init(char *libname, int verbose)
      * standard C extension libraries of one or both python versions. */
     if (python3_loaded())
     {
-	EMSG(_("E836: This Vim cannot execute :python after using :py3"));
+	if (verbose)
+	    EMSG(_("E836: This Vim cannot execute :python after using :py3"));
 	return FAIL;
     }
 #endif

src/if_python3.c

@@ -367,7 +367,8 @@ py3_runtime_link_init(char *libname, int verbose)
      * standard C extension libraries of one or both python versions. */
     if (python_loaded())
     {
-	EMSG(_("E837: This Vim cannot execute :py3 after using :python"));
+	if (verbose)
+	    EMSG(_("E837: This Vim cannot execute :py3 after using :python"));
 	return FAIL;
     }
 # endif

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    288,
 /**/
     287,
 /**/