Update dependencies to support Symfony 4.x

[odolbeau]

Fix #51

I changed the travis test matrix to avoid running too many tests.

As you can see, it now test:

• php 7.0 with lowest dependencies
• php 7.1
• php 7.2 (with coverage)
• php 7.2 with beta dependencies
• php nightly with beta dependencies (failure allowed)

If you want, I can also create the symfony recipe for this bundle.

[codecov-io]

Codecov Report

Merging #53 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #53   +/-   ##
=========================================
  Coverage     86.66%   86.66%           
- Complexity        0       26   +26     
=========================================
  Files             3        3           
  Lines           105      105           
=========================================
  Hits             91       91           
  Misses           14       14

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[odolbeau]

Looks good for me @tehplague! 👍

Tell me if you have any remark.

[l3ackslash0]

Hi,

Does this bundle support SF4.0 ?

Thanks in advance

[odolbeau]

With this PR, it should.