fix: getAllBy* methods return more elements than expected (#57)

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### Summary

While upgrading the RN dev dep to 0.57.5 our test suite caught a bug, where `getAllBy*` methods would return more elements than expected. This is fixed by making sure we check the proper type of the parameter when we compare it directly to `node.type` (should be a function, but we allowed strings)

### Test plan

Updated snapshot (yay! RN fixed the display names of View and Text)

Author: thymikee

package.json

@@ -24,7 +24,7 @@
     "jest": "^23.6.0",
     "metro-react-native-babel-preset": "^0.49.0",
     "react": "16.6.1",
-    "react-native": "^0.57.3",
+    "react-native": "^0.57.5",
     "react-test-renderer": "16.6.1",
     "release-it": "^7.6.2",
     "strip-ansi": "^5.0.0",

src/__tests__/__snapshots__/shallow.test.js.snap

@@ -13,11 +13,11 @@ exports[`shallow rendering React Test Instance 1`] = `
 `;
 
 exports[`shallow rendering React elements 1`] = `
-<Component>
-  <Component
+<View>
+  <Text
     testID="text-button"
   >
     Press me
-  </Component>
-</Component>
+  </Text>
+</View>
 `;

src/helpers/getByAPI.js

@@ -5,7 +5,7 @@ import ErrorWithStack from './errorWithStack';
 const getNodeByName = (node, name) =>
   node.type.name === name ||
   node.type.displayName === name ||
-  node.type === name;
+  (typeof name === 'function' && node.type === name);
 
 const getNodeByText = (node, text) =>
   (getNodeByName(node, 'Text') || getNodeByName(node, 'TextInput')) &&