Update Windows build to VS2017

.appveyor.yml

@@ -1,5 +1,5 @@
 version: '{build}'
-os: Visual Studio 2015
+os: Visual Studio 2017
 platform:
 - x86
 - x64

cppcore/include/kpm/calc_moments.hpp

@@ -38,7 +38,7 @@ void basic(Collector& collect, Vector r0, Vector r1, Matrix const& h2,
     auto const num_moments = collect.size();
     assert(num_moments % 2 == 0);
 
-    constexpr auto zero = Collector::zero();
+    auto const zero = Collector::zero();
     for (auto n = 2; n <= num_moments / 2; ++n) {
         auto m2 = zero, m3 = zero;
         auto const size = opt_size ? map.optimal_size(n, num_moments) : h2.rows();
@@ -66,7 +66,7 @@ void interleaved(Collector& collect, Vector r0, Vector r1, Matrix const& h2,
 
     // Interleave moments `n` and `n + 1` for better data locality
     // Diagonal + interleaved computes 4 moments per iteration
-    constexpr auto zero = Collector::zero();
+    auto const zero = Collector::zero();
     for (auto n = idx_t{2}; n <= num_moments / 2; n += 2) {
         auto m2 = zero, m3 = zero, m4 = zero, m5 = zero;
         auto const max1 = opt_size ? map.index(n,     num_moments) : map.last_index();

docs/install/advanced.rst

@@ -15,8 +15,8 @@ installing some dependencies.
 
 .. rubric:: Windows
 
-#. Install the `Visual C++ 2015 Runtime
-   <https://www.microsoft.com/en-us/download/details.aspx?id=53587>`_.
+#. Install the `Visual C++ 2017 Runtime
+   <https://go.microsoft.com/fwlink/?LinkId=746572>`_.
 
 #. Install numpy, scipy and matplotlib binaries from `Christoph Gohlke
    <http://www.lfd.uci.edu/~gohlke/pythonlibs/>`_.
@@ -63,7 +63,7 @@ Once you have everything, follow the steps below to compile and install pybindin
 
 .. rubric:: Windows
 
-#. Install `Visual Studio 2015 Community <https://www.visualstudio.com/products/visual-studio-community-vs>`_.
+#. Install `Visual Studio 2017 Community <https://www.visualstudio.com/vs/community/>`_.
    The Visual C++ compiler is required, so make sure to select it during the customization step
    of the installation (C++ may not be installed by default).
 #. Install `CMake`_.