Update to new schema version

custom-checks.json → goodtables-checks.json

 {
-    "$schema": "https://git.opendatafrance.net/validata/custom-checks-schema/raw/v0.1/custom_checks_schema.json",
+    "$schema": "https://git.opendatafrance.net/validata/goodtables-checks-schema/raw/v0.2/goodtables_checks_schema.json",
     "title": "Validations personnalisées en complément du schéma SCDL Délibérations",
     "author": "Pierre Dittgen, Jailbreak",
     "version": "0.1",
     "created": "2018-06-05",
     "homepage": "https://git.opendatafrance.net/",
-    "checks": [
+    "pre_checks": [
+        {
+            "name": "column-delimiter",
+            "params": {
+                "delimiter": ","
+            }
+        }
+    ],
+    "custom_checks": [
         {
             "name": "french-siret-value",
             "params": {