Update abstract-chart.js

Author: jansedlon

src/abstract-chart.js

@@ -66,7 +66,7 @@ class AbstractChart extends Component {
         y1={height - height / 4 + paddingTop}
         x2={width}
         y2={height - height / 4 + paddingTop}
-        stroke={this.props.chartConfig.color(0.2)}
+        stroke={this.props.chartConfig.color(0)}
         strokeDasharray="5, 10"
         strokeWidth={1}
       />
@@ -180,7 +180,7 @@ class AbstractChart extends Component {
         y1={0}
         x2={Math.floor(paddingRight)}
         y2={height - height / 4 + paddingTop}
-        stroke={this.props.chartConfig.color(0.2)}
+        stroke={this.props.chartConfig.color(0)}
         strokeDasharray="5, 10"
         strokeWidth={1}
       />