Added a placeholder subcircuit definition for sky130_fd_io__condiode,
because otherwise simulations involving I/O cells will fail.

VERSION

diff --git a/VERSION b/VERSION
index be76a0c..1a43809 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.146
+1.0.147

sky130/custom/sky130_fd_io/spice/sky130_fd_io.spice

diff --git a/sky130/custom/sky130_fd_io/spice/sky130_fd_io.spice b/sky130/custom/sky130_fd_io/spice/sky130_fd_io.spice
index e7b42be..30002f9 100644
--- a/sky130/custom/sky130_fd_io/spice/sky130_fd_io.spice
+++ b/sky130/custom/sky130_fd_io/spice/sky130_fd_io.spice
@@ -14,6 +14,12 @@
 *
 * SPDX-License-Identifier: Apache-2.0
 
+* Placeholder for "condiode", which probably represents the parasitic
+* well-to-substrate diode, although it does not take any parameters.
+.SUBCKT sky130_fd_io__condiode NEG POS
+.ENDS
+
+
 .SUBCKT sky130_fd_io__amuxsplitv2_delay ENABLE_VDDA_H HLD_VDDA_H_N HOLD RESET
 + VCC_IO VGND
 *.PININFO ENABLE_VDDA_H:I HLD_VDDA_H_N:I HOLD:O RESET:O VCC_IO:B