Update NEWS.md

Co-authored-by: cossio <cossio@users.noreply.github.com>

Author: mcabbott

NEWS.md

@@ -4,7 +4,7 @@
 * Fixed incorrect output and added GPU compatibility for [AlphaDropout](https://github.com/FluxML/Flux.jl/pull/1781).
 * Add trilinear [Upsample layer](https://github.com/FluxML/Flux.jl/pull/1792).
 * Improved [performance of RNNs](https://github.com/FluxML/Flux.jl/pull/1761)
-* Optimisers now accept an `ϵ` keyword argument
+* Optimisers now accept an `ϵ` argument
 * [Improved handling of complex values inputs](https://github.com/FluxML/Flux.jl/pull/1776) while training
 * Fixed [AlphaDropout](https://github.com/FluxML/Flux.jl/pull/1781)