typo in readme: Convinient->Convenient

Author: brian6932

README.md

@@ -9,7 +9,7 @@ ZString
 * All append methods are generics(`Append<T>(T value)`) and write to buffer directly instead of concatenate `value.ToString`
 * `T1`~`T16` AppendFormat(`AppendFormat<T1,...,T16>(string format, T1 arg1, ..., T16 arg16)` avoids boxing of struct argument
 * Also `T1`~`T16` Concat(`Concat<T1,...,T16>(T1 arg1, ..., T16 arg16)`) avoid boxing and `value.ToString` allocation
-* Convinient `ZString.Format/Concat/Join` methods can replace instead of `String.Format/Concat/Join`
+* Convenient `ZString.Format/Concat/Join` methods can replace instead of `String.Format/Concat/Join`
 * Can build both Utf16(`Span<char>`) and Utf8(`Span<byte>`) directly
 * Can use inner buffer to avoid allocate final string
 * Integrated with Unity TextMeshPro to avoid string allocation