Added alternative valid option to 'double serialization' test. (#1)

Author: amunra

ilp-client-interop-test.json

@@ -73,7 +73,10 @@
         ],
         "result": {
             "status": "SUCCESS",
-            "line": "doubles d0=0,dm0=-0,d1=1,dE100=1E+100,d0000001=1E-06,dN0000001=-1E-06"
+            "anyLines": [
+                "doubles d0=0,dm0=-0,d1=1,dE100=1E+100,d0000001=1E-06,dN0000001=-1E-06",
+                "doubles d0=0.0,dm0=-0.0,d1=1.0,dE100=1e100,d0000001=1e-6,dN0000001=-1e-6"
+            ]
         }
     },
     {