Update maven-compiler-plugin and fix bug on it to allow incremental compilation

[fabriciofx]

Let's update maven-compiler-plugin to 3.8.0 version and fix a bug in this plugin which doesn't allow incremental compilation that increase compile and running time. To fix both we need change pom.xml to:

<plugin>
  <artifactId>maven-compiler-plugin</artifactId>
  <version>3.8.0</version>
  <configuration>
    <source>1.8</source>
    <target>1.8</target>
    <useIncrementalCompilation>false</useIncrementalCompilation>
  </configuration>
</plugin>

Please, pay attention to <version> and <useIncrementalCompilation> tag.

[0crat]

@llorllale/z please, pay attention to this issue

[0crat]

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[victornoel]

@fabriciofx the objective is is to disable incremental compilation? Why do we want to do that? I see the other cactoos projects have this kind of setup, I don't understand why exactly, do you know?

[fabriciofx]

@victornoel I opened this issue a lot of time ago. It's because there is (or was) a bug in maven-compiler-plugin. I think this bug already was fixed. So, I'll close it, ok?

[0crat]

Job gh:llorllale/cactoos-matchers#112 is not assigned, can't get performer

[victornoel]

@fabriciofx ok, thank you, I removed the option in yegor256/cactoos#1412 for cactoos (I will do cactoos-matchers later) so we will see what happens without it :)