Update README.md

Author: CarloLucibello

README.md

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 A graph neural network library for Julia based on the deep learning framework [Flux.jl](https://github.com/FluxML/Flux.jl). Its features include:
 
-* Integratation with [Graphs.jl](https://github.com/JuliaGraphs/Graphs.jl).
+* Integration with [Graphs.jl](https://github.com/JuliaGraphs/Graphs.jl).
 * Implementation of common graph convolutional layers.
 * Fast operations on batched graphs. 
 * Easy to define custom layers.