Small spelling fixes in README (#411)

-   Changes the single instance of "data never leaves users' devices"
    to "Data never leaves user's device" to bring it more in line with
    the same phrase elsewhere in the readme.
-   "found" not "round"
-   "Failed to load bundle - Could not connect to development server" is
    word for word what you would see in the console as an error and
    should be monospaced.

README.md

@@ -8,7 +8,7 @@ We’re building the next generation of secure location logging to preserve priv
 
 Location logs provide time-stamped records of where users have been, allowing them to share information with health officials accurately and quickly. This helps support contact tracing efforts to slow the spread of the virus.
 
-What’s truly special about Safe Paths, though, is its privacy protection. Data never leaves users’ devices without their password entry and explicit consent. The location log generated by Safe Paths cannot be accessed from outside the user’s device, meaning data transfer occurs only if the user chooses to share it with the researcher.
+What’s truly special about Safe Paths, though, is its privacy protection. Data never leaves user's device without their password entry and explicit consent. The location log generated by Safe Paths cannot be accessed from outside the user’s device, meaning data transfer occurs only if the user chooses to share it with the researcher.
 
 ----
 
@@ -41,7 +41,7 @@ Refer to and run the dev_setup.sh (Linux/MacOS) or dev_setup.bat (Windows) for n
 ### iOS Configuration - First Time Setup
 
 1. Move to `ios` directory and run `pod install`
-2. If you have any trouble with packages not round, try `react-native link` from project directory.
+2. If you have any trouble with packages not found, try `react-native link` from project directory.
 3. Look at running commands below.
 
 ### Google Maps API Key
@@ -66,7 +66,7 @@ or
 npx react-native run-ios --simulator="iPhone 8 Plus"
 ```
 
-NOTE: In some cases, the abovementioned procedure leads to the error 'Failed to load bundle - Could not connect to development server'. In these cases, kill all other react-native processes and try it again.
+NOTE: In some cases, the abovementioned procedure leads to the error `Failed to load bundle - Could not connect to development server`. In these cases, kill all other react-native processes and try it again.
 
 ## Contributing