Update Node.js versions in .travis.yml

[ROZ-MOFUMOFU-ME]

This pull request includes several updates to enhance the functionality and compatibility of the project. The most important changes include updating the Node.js versions in the Travis CI configuration, adding new hashing algorithms, modifying the JobManager and pool modules to support additional algorithms and solo mining, refactoring buffer handling for better memory management, and updating the package version.

Node.js Version Updates:

• Updated Node.js versions in .travis.yml to include '16', '18', '20', and '22'.

New Hashing Algorithms:

• Added x16rv2, blake2s, groestlmyriad, and minotaur algorithms in lib/algoProperties.js. [1] [2] [3] [4]

JobManager and Pool Enhancements:

• Modified lib/jobManager.js to support new algorithms and added a parameter for solo mining in processShare function. [1] [2]
• Updated lib/pool.js to manage client difficulty settings more efficiently and support solo mining. [1] [2]

Buffer Handling Refactor:

• Replaced deprecated new Buffer with Buffer.from and Buffer.alloc in multiple files for better memory management. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]

Package Version Update:

• Updated the package version in package.json from 0.2.7 to 0.2.8.