docs: Fix image link for GitHub Pages

README.md

@@ -138,7 +138,7 @@ Most of the time, the minimum amount of data depends on the interval / time peri
 
 JavaScript is very bad with numbers. When calculating `0.1 + 0.2` it shows you `0.30000000000000004`, but the truth is `0.3`.
 
-![JavaScript arithmetic](./js-arithmetic.png)
+![JavaScript arithmetic](https://raw.githubusercontent.com/bennycode/trading-signals/HEAD/js-arithmetic.png)
 
 As specified by the ECMAScript standard, all arithmetic in JavaScript uses [double-precision floating-point arithmetic](https://en.wikipedia.org/wiki/Double-precision_floating-point_format), which is only accurate until certain extent. To increase the accuracy and avoid miscalculations, the [trading-signals](https://github.com/bennycode/trading-signals) library uses [big.js][1] which offers arbitrary-precision decimal arithmetic. However, this arbitrary accuracy comes with a downside: Calculations with it are not as performant as with the primitive data type `number`.