set StrategiesAsRepo immutable

[todo]

Enki/core/src/main/java/com/github/stcarolas/enki/core/repo/StrategiesAsRepo.java

Lines 70 to 73 in 5d1cead

	// TODO set StrategiesAsRepo immutable
	public StrategiesAsRepo setProvidersStrategy(Supplier<Seq<RepoProvider<? extends Repo>>> strategy) {
	this.providersStrategy = some(strategy);
	return this;

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This issue was generated by todo based on a TODO comment in 5d1cead.