Some icons are not aligned properly.

[Etzix]

Some of the icons available are not aligned properly, and need to be nudged with padding in order to be centered.

For example the ion icons "add-outline" and "add-circle-outline" need to have "padding-left: 2px" and "margin-top: -2" on it in order to be properly aligned horizontally.

See this issue comment for more info oblador/react-native-vector-icons#638 (comment)