esp8266/main: Bump heap size to 28K.

pfalcon · pfalcon · commit de5e0ed2e080 · 2016-05-09T19:02:40.000+03:00
This is kind of compensation for 4K FatFs buffer size which is eaten away
from it on FS mount. This should still leave enough of networking ("OS")
heap.
diff --git a/esp8266/main.c b/esp8266/main.c
@@ -38,7 +38,7 @@
 #include "gccollect.h"
 #include "user_interface.h"
 
-STATIC char heap[24 * 1024];
+STATIC char heap[28 * 1024];
 
 STATIC void mp_reset(void) {
     mp_stack_set_top((void*)0x40000000);
