Update API.md: add upperCaseLabel in Tabs (aksonov#2925)

From [react-navigation doc](https://reactnavigation.org/docs/tab-navigator.html#tabbaroptions-for-tabbartop-default-tab-bar-on-android), `upperCaseLabel` allow us to disable the default uppercase for tab labels (Tested with `4.0.0-beta.28`)
daviscabral · Jul 11, 2018 · 5895939 · 5895939
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diff --git a/docs/API.md b/docs/API.md
@@ -99,6 +99,7 @@ Can use all `props` listed above in `<Scene>` as `<Tabs>` is syntatic sugar for
 | `animationEnabled`     | `boolean` | `true` | Enable or disable tab swipe animation. |
 | `tabBarOnPress`     | `function` | | Custom tab bar icon press. |
 | `backToInitial`     | `boolean` | `false` | Back to initial screen on focused tab if tab icon was tapped. |
+| `upperCaseLabel`     | `boolean` | `true` | Whether to make label uppercase, default is true. |
 
 ## Stack (`<Stack>`)
 A component to group Scenes together for its own stack based navigation. Using this will create a separate navigator for this stack, so expect two navbars to appear unless you add `hideNavBar`.