Update README and CHANGELOG

CHANGELOG.md

@@ -6,7 +6,7 @@
   - Run each test case with a timeout
 
 
-## [Beta 4] - 2018-05-??
+## [Beta 4] - 2018-05-08
 
 ### Added
   - This changelog
@@ -18,9 +18,13 @@
     - RangeLookupInBst
     - ReverseLinkedListIterative
     - TwoSortedArraysMerge
+  - Separate compiler requirements for the solution projects  
 
 ### Changed
   - [IMPORTANT] Java project now requires at least Java 9 JDK
+  - [IMPORTANT] [Windows only] C++ project now requires at least Visual Studio 17 Preview 6 
+    - You are still free to use MinGW or LXSS compilers
+  - [IMPORTANT] Python project now requires at least Python 3.6
   - Java JSON library is divided into separate files
   - Some solution code improvements
 
@@ -29,7 +33,8 @@
   - Several warnings issued by VS2017  
 
 ### Removed
-  - All test cases with binary trees with height greater than 500
+  - All test cases with binary trees with height greater than 500 
+    - They may cause stack overflow on some systems
 
 
 ## [Beta 3] - 2018-04-05

README.md

@@ -80,20 +80,39 @@ If you do have issues, e.g., with install or with buggy tests, feel free to reac
 The IntelliJ Integrated Development environments described above are best-in-class, and have free versions that will work fine for the EPI Judge. They do not include the compilers. You can get the Java development environment from [Oracle](http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html), and the Python development environment from [Python.org](https://www.python.org/downloads/). For C++, you have multiple options. The simplest is to install [VisualStudio](https://code.visualstudio.com/download), which includes both the IDE and the compiler. Google is a good resource for installation help.
 
 - What compilers are supported for judge?
-  - **GCC** 5.4.1 (on Ubuntu 16.04)
-  - **Clang** 4.0 (on Ubuntu 16.04)
-  - **Apple LLVM Clang** 9.0.0
-  - **Visual Studio** 2017
-  - **Java** 9
-  - **Python** 3.6
+  - C++
+    - Linux
+      - **GCC** 5.4.1
+      - **Clang** 4.0
+    - OS X  
+      - **Apple LLVM Clang** 9.0.0
+    - Windows
+      - **Visual Studio** 2017 15.7.0 Preview 6
+        - Release version of VS2017 contains a bug that makes it impossible to compile judge programs
+      - **MinGW** GCC 5.4.0
+      - **LXSS** (Windows Subsystem for Linux) GCC 5.4.0
+  - Java     
+    - **Java** 9
+  - Python
+    - **Python** 3.6
+
 
 - What compilers are supported for solutions?
-  - **GCC** 7.0.0 (on Ubuntu 16.04)
-  - **Clang** 5.0 (on Ubuntu 16.04)
-  - **Apple LLVM Clang** 9.0.0
-  - **Visual Studio** 2017
-  - **Java** 9
-  - **Python** 3.6
+  - C++
+      - Linux
+        - **GCC** 7.0.0
+        - **Clang** 5.0
+      - OS X  
+        - **Apple LLVM Clang** 9.0.0
+      - Windows
+        - **Visual Studio** 2017 15.7.0 Preview 6
+            - Release version of VS2017 contains a bug that makes it impossible to compile judge programs
+        - **MinGW** GCC 7.2.0
+        - **LXSS** (Windows Subsystem for Linux) GCC 7.2.0
+    - Java     
+      - **Java** 9
+    - Python
+      - **Python** 3.6 
 
 Let us know if you managed to compile with an older version.