Added a custom fill_4 cell for the HD library, equivalent to what was done
in a previous commit for fill_8, to add diffusion into the cell that can be
used for solving FOM density issues.

VERSION

diff --git a/VERSION b/VERSION
index ca8e29f..f735e4f 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.200
+1.0.201

sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_4.gds

diff --git a/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_4.gds b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_4.gds
new file mode 100644
index 0000000..96329ca
--- /dev/null
+++ b/sky130/custom/sky130_fd_sc_hd/gds/sky130_ef_sc_hd__fill_4.gds
Binary files differ