deps(deps): bump github.com/grandecola/mmap (#89)

Bigqueue v0.5.0

  * Bigqueue is thread safe now
  * Bug fixes and performance optimizations

Add offset API similar to Kafka

Changelog -

  * Perform periodic data flush to disk
  * Add optimized functions to write string data
    directly into bigqueue

Major addition in this release is support for limited memory use.

Now, you can specify the max memory bigqueue is allowed to use
to store the data in memory. Rest of the data resides on disk.
This release also siginficantly optimises Dequeue functions and
improves code quality and code coverage.

This is the first release for the bigqueue library. It currently

provides only single threaded support to read and write to the
queue. Currently, all the data resides in memory all the time
and there is no garbage collection facility available.