replace br with horizontal lines in java blog posts

blog/java_1.md

@@ -90,7 +90,7 @@ Before you click away, I'd like to ask you some questions that you can answer by
 
 Anyway, thanks a lot for reading and happy coding! <3
 
-<br>
+***
 
 [^1]: Also, it's what Minecraft mods are written in, which is probably the reason most of you are here.
 

blog/java_2.md

@@ -152,7 +152,7 @@ If you're stuck, you can check out my solution [here](https://gist.github.com/El
 
 Thanks for reading this tutorial and I hope it helped you out! If you have any feedback or questions about it, you can click the discussion link below and ask me on Twitter, or join my Discord server using the widget on the main page. Happy coding!
 
-<br>
+***
 
 [^1]: I'm covering this topic *before* I cover what exactly classes and methods are. I think that conditions and loops take importance here, because they're used broadly in every language as well as most programs, whereas object orientation is a feature specific to some languages, as well as specific to more "complex" programs. It's also somewhat complicated, and I want to explain it right, because when I learned Java, I didn't even remotely understand it correctly at first.
 

blog/java_4.md

@@ -196,7 +196,7 @@ If you're stuck, you can [get some hints](https://gist.github.com/Ellpeck/462022
 
 Next time, we'll be talking about arrays and lists.[^5] Happy coding!
 
-<br>
+***
 
 [^1]: Java's default `Math` class already has an `abs` method that does this same thing, but for the sake of this tutorial, we'll ignore it (because I can't think of any other utility method to add, in all honesty).
 

blog/java_5.md

@@ -155,7 +155,7 @@ If you're stuck, you can [get some hints](https://gist.github.com/Ellpeck/3bdc69
 
 Happy coding!
 
-<br>
+***
 
 [^1]: Java's pointers work a lot differently from pointers in lower-level languages like C, because they're implicit: You don't create or manage them yourself. They're still called pointers though, so yea.