Cmake love (#55)

* Do CMake properly

* Remove uneeded file

* Add patch to version

* Init submodule in appveyor

* Use FetchContent

* Up CMake version requirement

* Use Xenial on Travis instead of Trusty

* Tidy traits

* Use Xenial repos

tests/test.cpp

@@ -1,32 +1,32 @@
-struct no_throw {
-  no_throw(std::string i) : i(i) {}
-  std::string i;
-};
-struct canthrow_move {
-  canthrow_move(std::string i) : i(i) {}
-  canthrow_move(canthrow_move const &) = default;
-  canthrow_move(canthrow_move &&other) noexcept(false) : i(other.i) {}
-  canthrow_move &operator=(canthrow_move &&) = default;
-  std::string i;
-};
-
-bool should_throw = false;
-struct willthrow_move {
-  willthrow_move(std::string i) : i(i) {}
-  willthrow_move(willthrow_move const &) = default;
-  willthrow_move(willthrow_move &&other) : i(other.i) {
-    if (should_throw)
-      throw 0;
-  }
-  willthrow_move &operator=(willthrow_move &&) = default;
-  std::string i;
-};
-
-int main() {
-  std::string s1 = "abcdefghijklmnopqrstuvwxyz";
-  std::string s2 = "zyxwvutsrqponmlkjihgfedcbaxxx";
-  tl::expected<no_throw, willthrow_move> a{s1};
-  tl::expected<no_throw, willthrow_move> b{tl::unexpect, s2};
-  should_throw = 1;
-  swap(a, b);
+struct no_throw {
+  no_throw(std::string i) : i(i) {}
+  std::string i;
+};
+struct canthrow_move {
+  canthrow_move(std::string i) : i(i) {}
+  canthrow_move(canthrow_move const &) = default;
+  canthrow_move(canthrow_move &&other) noexcept(false) : i(other.i) {}
+  canthrow_move &operator=(canthrow_move &&) = default;
+  std::string i;
+};
+
+bool should_throw = false;
+struct willthrow_move {
+  willthrow_move(std::string i) : i(i) {}
+  willthrow_move(willthrow_move const &) = default;
+  willthrow_move(willthrow_move &&other) : i(other.i) {
+    if (should_throw)
+      throw 0;
+  }
+  willthrow_move &operator=(willthrow_move &&) = default;
+  std::string i;
+};
+
+int main() {
+  std::string s1 = "abcdefghijklmnopqrstuvwxyz";
+  std::string s2 = "zyxwvutsrqponmlkjihgfedcbaxxx";
+  tl::expected<no_throw, willthrow_move> a{s1};
+  tl::expected<no_throw, willthrow_move> b{tl::unexpect, s2};
+  should_throw = 1;
+  swap(a, b);
 }