Update pybind11 submodule to v2.2

.appveyor.yml

@@ -1,5 +1,5 @@
 version: '{build}'
-image: Visual Studio 2015
+image: Visual Studio 2017
 platform:
 - x86
 - x64
@@ -8,7 +8,7 @@ environment:
   - PYTHON: 27
   - PYTHON: 36
   - CONDA: 27
-  - CONDA: 35
+  - CONDA: 36
 install:
 - ps: |
     git submodule update -q --init --recursive

.travis.yml

@@ -1,4 +1,5 @@
 language: cpp
+dist: trusty
 matrix:
   include:
   - os: linux
@@ -8,7 +9,7 @@ matrix:
   - os: linux
     env: CONDA=2.7
   - os: linux
-    env: CONDA=3.5
+    env: CONDA=3.6
   - os: osx
     env: PYTHON=2.7
   - os: osx
@@ -16,18 +17,7 @@ matrix:
   - os: osx
     env: CONDA=2.7
   - os: osx
-    env: CONDA=3.5
+    env: CONDA=3.6
-addons:
-  apt:
-    sources:
-    - ubuntu-toolchain-r-test
-    - deadsnakes
-    - kubuntu-backports
-    packages:
-    - g++-4.8
-    - python3.5
-    - python3.5-dev
-    - cmake
 before_install:
 - |
   if [ "$TRAVIS_OS_NAME" = "linux" ]; then export CXX=g++-4.8 CC=gcc-4.8; fi

pybind11

@@ -1 +1 @@
-Subproject commit e33ef9c20d36fe760792c61ccc95ecf1b42cf81d
+Subproject commit 2a5a5ec0a47c245fbf1bb1a8a90b4c3278e01693

src/main.cpp

@@ -4,14 +4,10 @@ int add(int i, int j) {
     return i + j;
 }
 
-int subtract(int i, int j) {
-    return i - j;
-}
-
 namespace py = pybind11;
 
-PYBIND11_PLUGIN(cmake_example) {
+PYBIND11_MODULE(cmake_example, m) {
-    py::module m("cmake_example", R"pbdoc(
+    m.doc() = R"pbdoc(
         Pybind11 example plugin
         -----------------------
 
@@ -22,7 +18,7 @@ PYBIND11_PLUGIN(cmake_example) {
 
            add
            subtract
-    )pbdoc");
+    )pbdoc";
 
     m.def("add", &add, R"pbdoc(
         Add two numbers
@@ -30,17 +26,15 @@ PYBIND11_PLUGIN(cmake_example) {
         Some other explanation about the add function.
     )pbdoc");
 
-    m.def("subtract", &subtract, R"pbdoc(
+    m.def("subtract", [](int i, int j) { return i - j; }, R"pbdoc(
         Subtract two numbers
 
         Some other explanation about the subtract function.
     )pbdoc");
 
 #ifdef VERSION_INFO
-    m.attr("__version__") = py::str(VERSION_INFO);
+    m.attr("__version__") = VERSION_INFO;
 #else
-    m.attr("__version__") = py::str("dev");
+    m.attr("__version__") = "dev";
 #endif
-
-    return m.ptr();
 }