Fix JSON.jl on 0.6/master

• Fix crashes on 0.6 and master

v0.17.0: Fix all existing deprecation warnings (#240)

* Fix Distributed module deprecation

* Fix IOBuffer deprecation

* Fix lpad deprecation

* Fix convert fallback deprecation

* Fix Symbol convert deprecation

v0.16.4

Associative -> AbstractDict (#230)

* Associative -> AbstractDict

* More updates/fixes for 0.7

v0.16.3

Fix for Base Unicode functions moving to stdlib (#229)

v0.16.2

Use Nullables (#227)

v0.16.1: Address breaking change on nightly (#226)

• Fix a breaking change on nightly (@Nosferican)

v0.16.0: Allow user to specify integer parsing type (fixes #223) (#224)

• Allow integer type to be specified @kmsquire

v0.15.2: Revisions for standard library (#221)

• Fix deprecation problems on 0.7

v0.15.1

• Restore Compat.jl dependency

v0.15.0: Drop v0.5 support, Compat dependency (#217)

• Fix deprecation warnings on latest master
• Drop support for Julia v0.5