Release 0.6.0

What's Changed

• [GH-141] Add BOP by @jealous in #142
• [GH-143] Retrieve Chande Momentum Oscillator by @jealous in #144
• [GH-145] Add Coppock Curve by @jealous in #146
• [GH-116] Add ichimoku cloud width by @jealous in #147
• [GH-148] Add Correlation Trend Indicator by @jealous in #149
• [GH-150] Fix pdm and ndm by @jealous in #151
• [GH-152] Extract Kaufman's Adaptive Moving Average by @jealous in #153
• [GH-154] Add Elder-Ray Index by @jealous in #155
• [GH-156] Add _Meta utility class by @jealous in #157
• [GH-158] Gaussian Fisher Transform Price Reversals by @jealous in #159
• [GH-160] Add Relative Vigor Index by @jealous in #161

Full Changelog: v0.5.4...v0.6.0