Typo: `lenght` -> `length`

[koxu1996]

I noticed 3 misspelled occurrences in the code:

casper-event-standard/casper-event-standard/src/contract.rs

Lines 30 to 37 in 24ef1df

	let lenght: u32 = storage::read(length_uref)
	.unwrap_or_revert()
	.unwrap_or_revert();
	let seed = event_dict_seed();
	let event_bytes = event.to_bytes().unwrap_or_revert();
	let event_bytes: Bytes = event_bytes.into();
	storage::dictionary_put(seed, &lenght.to_string(), event_bytes);
	storage::write(length_uref, lenght + 1);

[zie1ony]

Good catch. We'll fix it.