bump swagger-core to 1.6.7

Author: frantuma

pom.xml

@@ -394,7 +394,7 @@
         <commons-io-version>2.11.0</commons-io-version>
         <snakeyaml-version>1.32</snakeyaml-version>
         <slf4j-version>1.7.28</slf4j-version>
-        <swagger-core-version>1.6.6</swagger-core-version>
+        <swagger-core-version>1.6.7</swagger-core-version>
         <junit-version>4.13.1</junit-version>
         <testng-version>6.9.6</testng-version>
         <jmockit-version>1.19</jmockit-version>