Update information that needs to be updated on current README, including but not limited to:

• Installing and usage - partially covered in README (TODO: sufficient?)
• Platform support - fixed in Adds platform support info #67
• Adding versioning info - fixed in doc: add SemVer compliance to README #71 (unmerged)
• Changelog update - fixed in Adds next version changelog #66 (unmerged)
• Bash minimum version - fixed in Adds platform support info #67