👷 add Xcode 10.2

.travis.yml

@@ -155,11 +155,14 @@ matrix:
   - os: osx
     osx_image: xcode10.1
 
+  - os: osx
+    osx_image: xcode10.2
+
   # Linux / GCC
 
   - os: linux
     compiler: gcc
-    env: compiler=g++-4.8
+    env: COMPILER=g++-4.8
     addons:
       apt:
         sources: ['ubuntu-toolchain-r-test']
@@ -167,7 +170,7 @@ matrix:
 
   - os: linux
     compiler: gcc
-    env: compiler=g++-4.9
+    env: COMPILER=g++-4.9
     addons:
       apt:
         sources: ['ubuntu-toolchain-r-test']

README.md

@@ -1002,11 +1002,12 @@ json j_from_ubjson = json::from_ubjson(v_ubjson);
 
 Though it's 2019 already, the support for C++11 is still a bit sparse. Currently, the following compilers are known to work:
 
-- GCC 4.8 - 9.0 (and possibly later)
+- GCC 4.8 - 9.2 (and possibly later)
-- Clang 3.4 - 8.0 (and possibly later)
+- Clang 3.4 - 9.0 (and possibly later)
 - Intel C++ Compiler 17.0.2 (and possibly later)
 - Microsoft Visual C++ 2015 / Build Tools 14.0.25123.0 (and possibly later)
 - Microsoft Visual C++ 2017 / Build Tools 15.5.180.51428 (and possibly later)
+- Microsoft Visual C++ 2019 / Build Tools 16.3.1+1def00d3d (and possibly later)
 
 I would be happy to learn about other compilers/versions.
 
@@ -1027,7 +1028,7 @@ Please note:
 
 - Unsupported versions of GCC and Clang are rejected by `#error` directives. This can be switched off by defining `JSON_SKIP_UNSUPPORTED_COMPILER_CHECK`. Note that you can expect no support in this case.
 
-The following compilers are currently used in continuous integration at [Travis](https://travis-ci.org/nlohmann/json), [AppVeyor](https://ci.appveyor.com/project/nlohmann/json), and [Doozer](https://doozer.io):
+The following compilers are currently used in continuous integration at [Travis](https://travis-ci.org/nlohmann/json), [AppVeyor](https://ci.appveyor.com/project/nlohmann/json), [CircleCI](https://circleci.com/gh/nlohmann/json), and [Doozer](https://doozer.io):
 
 | Compiler              | Operating System             | Version String |
 |-----------------------|------------------------------|----------------|
@@ -1037,11 +1038,13 @@ The following compilers are currently used in continuous integration at [Travis]
 | GCC 4.9.4             | Ubuntu 14.04.1 LTS           | g++-4.9 (Ubuntu 4.9.4-2ubuntu1~14.04.1) 4.9.4 |
 | GCC 5.3.1 (armv7l)    | Ubuntu 16.04 LTS             | g++ (Ubuntu/Linaro 5.3.1-14ubuntu2) 5.3.1 20160413 |
 | GCC 5.5.0             | Ubuntu 14.04.1 LTS           | g++-5 (Ubuntu 5.5.0-12ubuntu1~14.04) 5.5.0 20171010 |
+| GCC 6.3.0             | Debian 9 (stretch)           | g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 |
 | GCC 6.3.1             | Fedora release 24 (Twenty Four) | g++ (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1) |
 | GCC 6.4.0             | Ubuntu 14.04.1 LTS           | g++-6 (Ubuntu 6.4.0-17ubuntu1~14.04) 6.4.0 20180424 |
 | GCC 7.3.0             | Ubuntu 14.04.1 LTS           | g++-7 (Ubuntu 7.3.0-21ubuntu1~14.04) 7.3.0 |
 | GCC 7.3.0             | Windows Server 2012 R2 (x64) | g++ (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 7.3.0 |
 | GCC 8.1.0             | Ubuntu 14.04.1 LTS           | g++-8 (Ubuntu 8.1.0-5ubuntu1~14.04) 8.1.0 |
+| GCC 9.2.1             | Ubuntu 14.05.1 LTS           | g++-9 (Ubuntu 9.2.1-16ubuntu1~14.04.1) 9.2.1 20191030 |
 | Clang 3.5.0           | Ubuntu 14.04.1 LTS           | clang version 3.5.0-4ubuntu2~trusty2 (tags/RELEASE_350/final) (based on LLVM 3.5.0) |
 | Clang 3.6.2           | Ubuntu 14.04.1 LTS           | clang version 3.6.2-svn240577-1~exp1 (branches/release_36) (based on LLVM 3.6.2) |
 | Clang 3.7.1           | Ubuntu 14.04.1 LTS           | clang version 3.7.1-svn253571-1~exp1 (branches/release_37) (based on LLVM 3.7.1) |
@@ -1059,7 +1062,8 @@ The following compilers are currently used in continuous integration at [Travis]
 | Clang Xcode 10.0      | OSX 10.13.3                  | Apple LLVM version 10.0.0 (clang-1000.11.45.2) |
 | Clang Xcode 10.1      | OSX 10.13.3                  | Apple LLVM version 10.0.0 (clang-1000.11.45.5) |
 | Visual Studio 14 2015 | Windows Server 2012 R2 (x64) | Microsoft (R) Build Engine version 14.0.25420.1, MSVC 19.0.24215.1 |
-| Visual Studio 2017    | Windows Server 2016 | Microsoft (R) Build Engine version 15.7.180.61344, MSVC 19.14.26433.0 |
+| Visual Studio 15 2017 | Windows Server 2012 R2 (x64) | Microsoft (R) Build Engine version 15.9.21+g9802d43bc3, MSVC 19.16.27032.1 |
+| Visual Studio 16 2019 | Windows Server 2012 R2 (x64) | Microsoft (R) Build Engine version 16.3.1+1def00d3d, MSVC 19.23.28106.4 |
 
 ## License