Add schema fileNamePrefix for multiple grapnel schema support

graphql-fetch-schema

diff --git a/node_modules/graphql-fetch-schema/lib/index.js b/node_modules/graphql-fetch-schema/lib/index.js
index 0411d13..bf385e4 100644
--- a/node_modules/graphql-fetch-schema/lib/index.js
+++ b/node_modules/graphql-fetch-schema/lib/index.js
@@ -59,14 +59,14 @@ function () {
 
     if (options.graphql) {
       files.push({
-        filePath: _path.default.resolve(pathPrefix, 'schema.graphql'),
+        filePath: _path.default.resolve(pathPrefix, options.fileNamePrefix ? options.fileNamePrefix + '.schema.graphql' : 'schema.graphql'),
         contents: (0, _graphql.printSchema)((0, _graphql.buildClientSchema)(schema.data))
       });
     }
 
     if (options.json) {
       files.push({
-        filePath: _path.default.resolve(pathPrefix, 'schema.json'),
+        filePath: _path.default.resolve(pathPrefix, options.fileNamePrefix ? options.fileNamePrefix + '.schema.json' : 'schema.json'),
         contents: JSON.stringify(schema, null, 2)
       });
     }