Updates (#57)

* Protect against bad glb header data (AFL fuzzing run)
* Fix Viewer project file; asset copy didn't work

* Updated test version of nlohmann::json
* Update glTF-Sample-Models and tests
* Update linux test environment
* Update CLI11
* Update d3dx12.h
* Update catch2
* Tweak readme

.travis.yml

@@ -1,6 +1,6 @@
 language: cpp
 
-dist: trusty
+dist: xenial
 sudo: required
 group: edge
 
@@ -51,7 +51,7 @@ matrix:
       - TEST_LANGUAGE_STANDARD=14
     addons:
       apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-5.0']
         packages: ['g++-7', 'clang-5.0', 'ninja-build']
 
   - os: linux
@@ -61,9 +61,30 @@ matrix:
       - TEST_LANGUAGE_STANDARD=17
     addons:
       apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-6.0']
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-6.0']
         packages: ['g++-7', 'clang-6.0', 'ninja-build']
 
+  - os: linux
+    compiler: clang
+    env:
+      - COMPILER=clang++-7
+      - TEST_LANGUAGE_STANDARD=17
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-7']
+        packages: ['g++-8', 'clang-7', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env:
+      - COMPILER=clang++-8
+      - TEST_LANGUAGE_STANDARD=17
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-xenial-8']
+        packages: ['g++-8', 'clang-8', 'ninja-build']
+
+
 ################
 # build script #
 ################

README.md

@@ -91,7 +91,7 @@ See the DirectX 12 enabled [viewer](examples/viewer) example for a demonstration
 | ------------| -------------------------- |
 | .gltf files w/external resources  | 100% complete and passing  |
 | .gltf files w/embedded resources  | 100% complete and passing (2 models excluded due to out-of-spec mimetypes)  |
-| .gltf files w/pbrSpecularGlossiness extension | 100% complete and passing  |
+| .gltf files w/Draco extension     | 100% complete and passing  |
 | .glb files                        | 100% complete and passing  |
 
 * Safety