nit

Author: mikaelm12

src/SignalR/clients/java/signalr/src/main/java/com/microsoft/signalr/HubConnection.java

@@ -454,7 +454,7 @@ private void stopConnection(String errorMessage) {
      */
     public void send(String method, Object... args) {
         if (hubConnectionState != HubConnectionState.CONNECTED) {
-            throw new RuntimeException("The 'send' method cannot be called if the connection is not active");
+            throw new RuntimeException("The 'send' method cannot be called if the connection is not active.");
         }
 
         InvocationMessage invocationMessage = new InvocationMessage(null, method, args);
@@ -473,7 +473,7 @@ public void send(String method, Object... args) {
     @SuppressWarnings("unchecked")
     public <T> Single<T> invoke(Class<T> returnType, String method, Object... args) {
         if (hubConnectionState != HubConnectionState.CONNECTED) {
-            throw new RuntimeException("The 'invoke' method cannot be called if the connection is not active");
+            throw new RuntimeException("The 'invoke' method cannot be called if the connection is not active.");
         }
 
         String id = connectionState.getNextInvocationId();

src/SignalR/clients/java/signalr/src/test/java/com/microsoft/signalr/HubConnectionTest.java

@@ -900,7 +900,7 @@ public void cannotSendBeforeStart()  {
         assertEquals(HubConnectionState.DISCONNECTED, hubConnection.getConnectionState());
 
         Throwable exception = assertThrows(RuntimeException.class, () -> hubConnection.send("inc"));
-        assertEquals("The 'send' method cannot be called if the connection is not active", exception.getMessage());
+        assertEquals("The 'send' method cannot be called if the connection is not active.", exception.getMessage());
     }
 
     @Test
@@ -909,7 +909,7 @@ public void cannotInvokeBeforeStart()  {
         assertEquals(HubConnectionState.DISCONNECTED, hubConnection.getConnectionState());
 
         Throwable exception = assertThrows(RuntimeException.class, () -> hubConnection.invoke(String.class, "inc", "arg1"));
-        assertEquals("The 'invoke' method cannot be called if the connection is not active", exception.getMessage());
+        assertEquals("The 'invoke' method cannot be called if the connection is not active.", exception.getMessage());
     }
 
     @Test