Update parent pom version and Travis configuration

[scordio]

This PR:

• should fix the recent build issue, updating Travis configuration as Oracle JDK 8 is not supported anymore and removing the JaCoCo configuration which is already provided by the parent pom
• should fix the issue on javancss-maven-plugin fails on java 8+ codebase assertj/assertj-parent-pom#38
• simplifies the license plugin configuration which is already provided by the parent pom

[codecov]

Codecov Report

Merging #31 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #31   +/-   ##
=========================================
  Coverage     99.09%   99.09%           
  Complexity      158      158           
=========================================
  Files            24       24           
  Lines           330      330           
  Branches         51       51           
=========================================
  Hits            327      327           
  Misses            2        2           
  Partials          1        1

Impacted Files	Coverage Δ	Complexity Δ
...org/assertj/neo4j/error/ShouldNotHaveProperty.java	100% <ø> (ø)	2 <0> (ø)	⬇️
.../assertj/neo4j/error/ShouldNotHavePropertyKey.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...assertj/neo4j/error/ShouldEndWithRelationship.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...org/assertj/neo4j/api/PropertyContainerAssert.java	100% <ø> (ø)	15 <0> (ø)	⬇️
.../assertj/neo4j/api/ConstraintDefinitionAssert.java	100% <ø> (ø)	8 <0> (ø)	⬇️
.../java/org/assertj/neo4j/error/ShouldHaveLabel.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...va/org/assertj/neo4j/error/ShouldNotHaveLabel.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...a/org/assertj/neo4j/api/IndexDefinitionAssert.java	100% <ø> (ø)	14 <0> (ø)	⬇️
...rg/assertj/neo4j/error/ShouldNotStartWithNode.java	100% <ø> (ø)	3 <0> (ø)	⬇️
...rc/main/java/org/assertj/neo4j/api/PathAssert.java	100% <ø> (ø)	26 <0> (ø)	⬇️
... and 14 more

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[fbiville]

Works like a charm, thanks!