Fixed bug when jemoji is included via module-info.java

[Terge3141]

Dear felldo,
first of all, let me say that this is really a great library! It is exactly what I was looking for.
It tried to include JEmoji into my java project where I use module-info.java. However, several functions such as EmojiManager.getAllEmojis() throw an exception (see below). emojitest.tar.gz contains an example project which will reproduce the error .
The reason is that readFileAsString cannot load the ressource-path PATH by means of classLoader.getResourceAsStream(PATH). According to stackeroverflow.com one should use EmojiManager.class.getResourceAsStream(PATH) instead. This is the content of the PR.

It would be great if you could merge my PR.

Best regards,

Michael

Error message:
------------------------------------------snip------------------------------------------
Exception in thread "main" java.lang.ExceptionInInitializerError
at test/test.Program.main(Program.java:11)
Caused by: java.lang.IllegalArgumentException: argument "content" is null
at [email protected]/com.fasterxml.jackson.databind.ObjectMapper._assertNotNull(ObjectMapper.java:5054)
at [email protected]/com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3828)
at net.fellbaum.jemoji/net.fellbaum.jemoji.EmojiManager.(EmojiManager.java:38)
... 1 more
------------------------------------------snap------------------------------------------

[felldo]

Hi, thank you for reporting this.
Can you please upload your example to i.e. a git repo / gist / a branch in your forked repository of JEmoji so I can have a look at it?
Opening zip files from an untrusted source can be dangerous due to things like zip bombs.

[Terge3141]

Sure, see https://github.com/Terge3141/JEmoji/tree/example/emojitest

[felldo]

I have tested this a bit in different scenarios and this seems to be okay. Thanks!