spec/plugins: fix 'ip'->'ips' in the spec, bump to 0.3.1

pkg/invoke/exec_test.go

@@ -50,7 +50,7 @@ var _ = Describe("Executing a plugin, unit tests", func() {
 			VersionDecoder: versionDecoder,
 		}
 		pluginPath = "/some/plugin/path"
-		netconf = []byte(`{ "some": "stdin", "cniVersion": "0.3.0" }`)
+		netconf = []byte(`{ "some": "stdin", "cniVersion": "0.3.1" }`)
 		cniargs = &fakes.CNIArgs{}
 		cniargs.AsEnvCall.Returns.Env = []string{"SOME=ENV"}
 	})

pkg/invoke/raw_exec_test.go

@@ -58,7 +58,7 @@ var _ = Describe("RawExec", func() {
 			"CNI_PATH=/some/bin/path",
 			"CNI_IFNAME=some-eth0",
 		}
-		stdin = []byte(`{"some":"stdin-json", "cniVersion": "0.3.0"}`)
+		stdin = []byte(`{"some":"stdin-json", "cniVersion": "0.3.1"}`)
 		execer = &invoke.RawExec{}
 	})