v0.17.0

• supports custom src formats with srcConverters prop: which contains toSrc and fromSrc callbacks
• transposes chart types that have 2 dimensional data, as plotly.js has a row based approach to these: 'contour', 'contourgl', 'heatmap', 'heatmapgl', 'surface', 'carpet', 'contourcarpet'. Exception: 'table' trace is column based.