One more fix to the sky130 fill algorithm in magic, because the
fill shapes can get 5nm shaved off the size, and 0.490 x 0.485 is
just barely below the minimum area.  Revised the smallest size
of the m3 and m4 fill shapes from 0.490 to 0.500um.

VERSION

diff --git a/VERSION b/VERSION
index 624016c..224b658 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.487
+1.0.488

sky130/magic/sky130.tech

diff --git a/sky130/magic/sky130.tech b/sky130/magic/sky130.tech
index 6af7b20..9156c45 100644
--- a/sky130/magic/sky130.tech
+++ b/sky130/magic/sky130.tech
@@ -2296,11 +2296,11 @@
 	or	met3fill_coarse,met3fill_medium,met3fill_fine
         grow    300
  templayer	met3fill_veryfine topbox
-        slots   0 490 300 0 490 300 150 200
+        slots   0 500 300 0 500 300 150 200
         and-not obstruct_m3_veryfine
 	and	topbox
-        shrink  240
-        grow    240
+        shrink  245
+        grow    245
 
  layer	MET3FILL met3fill_coarse
 	or	met3fill_medium
@@ -2358,11 +2358,11 @@
 	or	met4fill_coarse,met4fill_medium,met4fill_fine
         grow    300
  templayer	met4fill_veryfine topbox
-        slots   0 490 300 0 490 300 150 300
+        slots   0 500 300 0 500 300 150 300
         and-not obstruct_m4_veryfine
 	and	topbox
-        shrink  240
-        grow    240
+        shrink  245
+        grow    245
 
  layer	MET4FILL met4fill_coarse
 	or	met4fill_medium