Corrected the sky130 JSON file to add a couple of missing commas
that break JSON syntax.

VERSION

diff --git a/VERSION b/VERSION
index aeffd51..19e25b6 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.315
+1.0.316

sky130/sky130.json

diff --git a/sky130/sky130.json b/sky130/sky130.json
index 56ba0b8..566764e 100644
--- a/sky130/sky130.json
+++ b/sky130/sky130.json
@@ -87,7 +87,7 @@
     "commit": {
 	"open_pdks": "OPEN_PDKS_COMMIT",
 	"magic": "MAGIC_COMMIT"
-    }
+    },
     "reference": {
 	"open_pdks": "d7faec2b6f384254449e0172c4f26083f77d3ff5",
 	"magic": "fe2eb6d3906ed15ade0e7a51daea80dd4e3846e2",
@@ -96,7 +96,7 @@
 	"sky130_osu_sc_t15": "f1eef844734f73d3c79d83b82352118263eb7686",
 	"sky130_osu_sc_t18": "3128b623aaea315248d39173e09b49a3dc82aa40",
 	"sky130_sram_macros": "c2333394e0b0b9d9d71185678a8d8087715d5e3b",
-	"sky130_ml_xx_hd": "6eb3b0718552b034f1bf1870285ff135e3fb2dcb"
+	"sky130_ml_xx_hd": "6eb3b0718552b034f1bf1870285ff135e3fb2dcb",
 	"xschem_sky130": "16efae642739ba5c50aa2a40e403b036a5e31a6c"
     }
 }