Bump oj from 3.7.4 to 3.7.6

[dependabot-preview]

Bumps oj from 3.7.4 to 3.7.6.

Changelog

Sourced from oj's changelog.

3.7.6 - 2018-12-30

• Changed time encoding for 32 bit to work around a Ruby bug in rb_time_timespec() that fails for times before 1970.

• Addressed issue #514 by changing reserved identifiers.

• Addressed issue #515 by adding return value checks on strdup() and pthread_mutex_init().

3.7.5 - 2018-12-27

• Address issue #517 with a special escape table for mimicing the JSON gem.

Commits

• d678089 Change reserved identifiers and check return values
• 8384cbb 32 bit (#521)
• d50dfbb Escape table for mimicing the JSON gem.
• 479cc0f Merge branch 'escape'
• 99bb558 Add test
• 3cf802d Merge branch 'master' of github.com:ohler55/oj
• 8ba7380 make clean on new ruby
• 8446e2d render modes options as table (#519)
• e0f3094 Rails is special
• d75d342 Add JSON gem specific escape table
• Additional commits viewable in compare view

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