Updated dependencies to allow history 4.x

[jthomaschewski]

It seems as if this package does still work fine with react-router@^4.0.0 + [email protected]
At least I haven't experienced any problems yet with a piwik-react-router+redux+react-router-redux... setup.

As the peerDependency is locked to ^3.0.0, it breaks npm install for me. That why I've created this trivial PR.

There still might be incompatibilities. I haven't thoroughly tested the package against history v4

[coveralls]

Coverage remained the same at 100.0% when pulling 3e19d53 on jbbr:master into 835dafd on joernroeder:master.

[joernroeder]

@JBBr thanks for opening this pull request – updating the package to history v4 stands on my (never ending) todo-list for a while now.
I don't see any problem or incompatibility (coverage looks good and is at it's maximum) and will release it as version 0.8.0.

[joernroeder]

release 0.8.0 is live on npm :)