v2.15.0

PRs in this release:

• Add GH action to auto publish packages on Tag (#216) @drew887
• Bug Fix 109: Added the symbol param in the get order call (#143) @FossilBlade
• added getClock() to readme (#159) @ashish-patwal
• Fixing Typos in Comments of websocket_example_datav2.js Example. (#203) @WikipediaBrown
• Fixes some simple cases of not checking for null/undefined (#213) @drew887
• Fix up some typos in README (#214) @drew887
• Update Readme dataV2 (#209) @noramehesz
• Fix limit in multi data calls (#210) @noramehesz