Changed Qt 5.11.2 -> 5.12.2 in docs

Author: vkjr

docs/ContributorEnvSetup.md

@@ -46,7 +46,7 @@ Run [fix-formatting.sh](https://github.com/status-im/react-native-desktop/blob/m
 In `Qt Creator` select menu `File`->`Open File or Project...`.  
 Navigate to the root directory of your `react-native-desktop` clone and select `CMakeList.txt` file to open.
 
-Select Qt 5.11.2 toolchain to configure the project, if prompted.
+Select Qt 5.12.2 toolchain to configure the project, if prompted.
 
 By default, Qt configures `CMake` to do out-of-directory build on one level higher than your repo clone directory.
 
@@ -77,7 +77,7 @@ Like you do when [run your new app](CreateNewApp.md#run-the-project)
 1. Build and run `react-native-desktop` as described above
 2. Open `Projects` tab in Qt Creator and select `Run` under `Build & Run` section of left pane
 3. Add new `run configuration` for `Custom executable`, and name it `TicTacToe`.
-4. Place path to qmlscene binary in `Executable` field: `/Users/USER_NAME/Qt/5.11.2/clang_64/bin/qmlscene`
+4. Place path to qmlscene binary in `Executable` field: `/Users/USER_NAME/Qt/5.12.2/clang_64/bin/qmlscene`
 5. In `command line arguments` set `-I ./ReactQt/runtime/src/ ./Examples/TicTacToe/TicTacToe.qml`
 6. in `working directory` set `%{buildDir}`
 7. Select `Build`->`Run` Qt Creator menu option to run TicTacToe example application.

docs/InspectAppWithGammaRay.md

@@ -11,7 +11,7 @@ Steps to build it (inside cloned src folder):
 ```
 mkdir build
 cd build
-cmake -DCMAKE_PREFIX_PATH=PATH_TO_YOUR_QT_FOLDER/5.11.2/gcc_64/lib/cmake ..
+cmake -DCMAKE_PREFIX_PATH=PATH_TO_YOUR_QT_FOLDER/5.12.2/gcc_64/lib/cmake ..
 make
 make install
 ```

docs/InstallPrerequisites.md

@@ -14,7 +14,7 @@ Recommended way to install required tools and libs is to use [Chocolatey](https:
 choco install -y nodejs.install python2 cmake git
 ```
 
-Download and run [Qt 5.11.2](https://download.qt.io/archive/qt/5.11/5.11.2/qt-opensource-windows-x86-5.11.2.exe) installer for Windows. During installation process on `Select Components` screen check `Qt 5.11.2 / MinGW 5.3.0 32 bit`, `Qt 5.11.2 / Qt WebEngine` and `Tools / MinGW 5.3.0` components. Finish installation process.
+Download and run [Qt 5.12.2](https://download.qt.io/archive/qt/5.12/5.12.2/qt-opensource-windows-x86-5.12.2.exe) installer for Windows. During installation process on `Select Components` screen check `Qt 5.12.2 / MinGW 5.3.0 32 bit`, `Qt 5.12.2 / Qt WebEngine` and `Tools / MinGW 5.3.0` components. Finish installation process.
 
 ### Mac OS
 
@@ -24,15 +24,15 @@ Recommended way to install required tools and libs is to use [Homebrew](https://
 brew install node watchman cmake
 ```
 
-Download and run [Qt 5.11.2](https://download.qt.io/archive/qt/5.11/5.11.2/qt-opensource-mac-x64-5.11.2.dmg) installer for Mac OS. During installation process on `Select Components` screen check `Qt 5.11.2 / macOS` and `Qt 5.11.2 / Qt WebEngine` components. Finish installation process.
+Download and run [Qt 5.12.2](https://download.qt.io/archive/qt/5.12/5.12.2/qt-opensource-mac-x64-5.12.2.dmg) installer for Mac OS. During installation process on `Select Components` screen check `Qt 5.12.2 / macOS` and `Qt 5.12.2 / Qt WebEngine` components. Finish installation process.
 
 ### Ubuntu
 
 ```
 sudo apt-get install -y git cmake nodejs-legacy npm gnome-terminal
 ```
 
-Download and run [Qt 5.11.2](https://download.qt.io/archive/qt/5.11/5.11.2/qt-opensource-linux-x64-5.11.2.run) installer for Linux. Finish installation process.
+Download and run [Qt 5.12.2](https://download.qt.io/archive/qt/5.12/5.12.2/qt-opensource-linux-x64-5.12.2.run) installer for Linux. Finish installation process.
 
 ### Fedora
 
@@ -45,4 +45,4 @@ sudo dnf install -y nodejs npm cmake git qt5-devel gnome-terminal
 Make sure that installed Qt's `qmake` tool is available in your PATH.
 On mac and linux you can add following to `.bash_profile`:
 
-`export PATH=$PATH:/Users/MyUser/Qt/5.11.2/COMPILER_NAME/bin`
+`export PATH=$PATH:/Users/MyUser/Qt/5.12.2/COMPILER_NAME/bin`