[schema][algorithm][v1] Put back missing schema_version

While refactoring the field got lost in the v1 schema.

beat/core/schema/algorithm/1.json

@@ -15,6 +15,7 @@
       "type": "object",
 
       "properties": {
+        "schema_version": { "$ref": "common.json#/definitions/schema_version" },
         "language": { "$ref": "../common/1.json#/definitions/language" },
         "description": { "$ref": "../common/1.json#/definitions/description" },
         "groups": { "$ref": "common.json#/definitions/block_groups" },
@@ -38,6 +39,7 @@
       "type": "object",
 
       "properties": {
+        "schema_version": { "$ref": "common.json#/definitions/schema_version" },
         "language": { "$ref": "../common/1.json#/definitions/language" },
         "description": { "$ref": "../common/1.json#/definitions/description" },
         "groups": { "$ref": "common.json#/definitions/analyzer_groups" },