Added missing <array> header

pauljurczak · lava · commit f64f1f6583e4 · 2019-03-19T11:47:11.000+01:00
VS2017 failed to compile due to missing `#include &lt;array&gt;`
diff --git a/matplotlibcpp.h b/matplotlibcpp.h
@@ -2,6 +2,7 @@
 
 #include <vector>
 #include <map>
+#include <array>
 #include <numeric>
 #include <algorithm>
 #include <stdexcept>
