v0.3.0

Refactor to use Popper.js

• shoutout to @nbond211 and #27
• tooltips now respect screen bounds
• tooltips now have arrows

Full Changelog

• updates documentation (3b8ccbb)
• updates popper.js to v1.14.3 (f3fcc8e)
• fixes tooltip arrow position (22568b1)
• fixes position of arrow when tooltip flips (508cb58)
• fixes reference to this.data to be this._data and fixes check whether this._position is an array or HTMLElement (0f0dae3)
• modifies default tooltip arrow styles to hide border (669f722)
• replaces reference to this._className with "d3plus-tooltip" and fixes language in description for public arrow method (ba1ee1f)
• adds public methods for arrow and arrowStyle (e330091)
• renames translate method to position and allows it to accept HTMLElements as input (05b921d)
• moves tooltip render logic into loop to handle multiple data points (c0738ae)
• adds calculations for the offset from the tooltip arrow (2303dc2)
• adds arrow to tooltip (work in progress) (aef8d61)
• adds mouse following behavior to Popper.js tooltip (c3b1523)
• first pass at refactoring tooltip to use Popper.js (85a3890ond211 )
• installs popper.js and updates dependencies (d026fa5)
• updates environment files (03019d8)
• updates d3plus-dev to v0.6.3 (9a4ecac)
• updates d3-selection to v1.3.0 (f4855a6)
• updates d3plus-common to v0.6.33 (2427161)