Upgrade PIT 1.3.2 -> 1.4.3 (#31)

See:
- https://github.com/hcoles/pitest/releases/tag/pitest-parent-1.4.0
- https://github.com/hcoles/pitest/releases/tag/pitest-parent-1.4.1
- https://github.com/hcoles/pitest/releases/tag/pitest-parent-1.4.2
- https://github.com/hcoles/pitest/releases/tag/pitest-parent-1.4.3
- hcoles/pitest@pitest-parent-1.3.2...pitest-parent-1.4.3

pom.xml

@@ -661,7 +661,7 @@
                 <plugin>
                     <groupId>org.pitest</groupId>
                     <artifactId>pitest-maven</artifactId>
-                    <version>1.3.2</version>
+                    <version>1.4.3</version>
                     <executions>
                         <execution>
                             <id>compute-mutation-coverage</id>