Segfault when running any example with Edge

When running any of the examples with the `edge` feature enabled I'm getting an access violation (exit code: 0xc0000409, STATUS_STACK_BUFFER_OVERRUN).

```
ucrtbase.dll!abort()
ucrtbase.dll!terminate()
dialog.exe!`winrt::to_hresult'::`1'::catch$5() Line 4599
at C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt\winrt\base.h(4599)
vcruntime140_1.dll!_CallSettingFrame_LookupContinuationIndex()
vcruntime140_1.dll!__FrameHandler4::CxxCallCatchBlock(struct _EXCEPTION_RECORD *)
ntdll.dll!RcConsolidateFrames()
dialog.exe!winrt::to_hresult() Line 4574
at C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt\winrt\base.h(4574)
dialog.exe!`winrt::impl::delegate>::type<>::Invoke'::`1'::catch$0() Line 9017
at C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt\winrt\base.h(9017)
vcruntime140_1.dll!_CallSettingFrame_LookupContinuationIndex()
vcruntime140_1.dll!__FrameHandler4::CxxCallCatchBlock(struct _EXCEPTION_RECORD *)
ntdll.dll!RcConsolidateFrames()
dialog.exe!winrt::impl::delegate>::type<>::Invoke(void * sender=0x0000021e6c392c80, void * args=0x0000021e6c392a00) Line 9015
at C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt\winrt\base.h(9015)
EdgeManager.dll!Microsoft::WRL::InvokeTraits<-2>::InvokeDelegates<,Windows::Foundation::ITypedEventHandler>()
EdgeManager.dll!Microsoft::WRL::EventSource,struct Microsoft::WRL::InvokeModeOptions<-2> >::InvokeAll(struct Windows::UI::Core::ICoreWindowSite *,struct Windows::UI::Core::INavigationFocusEventArgs *)
EdgeManager.dll!Windows::Web::UI::WebViewControlBase::OnCoreWebViewNavigationStarting(struct ICoreWebViewPrivate *,struct CoreWebViewNavigationStartingEventDetails *,int *)
EdgeManager.dll!CCoreWebViewControl::CanNavigate(unsigned short *,long &)
EdgeManager.dll!CCoreWebViewControl::NavigateToStringInternal(unsigned short *)
EdgeManager.dll!CCoreWebViewControl::NavigateToString(unsigned short *)
EdgeManager.dll!Windows::Web::UI::WebViewControlBase::NavigateToString(struct HSTRING__ *)
dialog.exe!winrt::impl::consume_Windows_Web_UI_IWebViewControl::NavigateToString(const winrt::param::hstring & text={...}) Line 116
at C:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt\winrt\Windows.Web.UI.h(116)
dialog.exe!webview::webview::navigate(const char * url=0x0000021e69c1eb90) Line 628
at C:\Users\samgr\src\web-view-rs\webview-sys\webview_edge.h(628)
dialog.exe!webview_navigate(void * w=0x0000021e69c1ce50, const char * url=0x0000021e69c1eb90) Line 714
at C:\Users\samgr\src\web-view-rs\webview-sys\webview_edge.h(714)
dialog.exe!wrapper_webview_new(const char * title=0x0000021e69c27f50, const char * url=0x0000021e69c1eb90, int width=800, int height=600, int resizable=1, int debug=1, void(*)(void *, const char *) external_invoke_cb=0x00007ff6e7d03ba0, void * userdata=0x0000021e69c29bf0) Line 15
at C:\Users\samgr\src\web-view-rs\webview-sys\webview_edge.cc(15)
dialog.exe!web_view::WebView<()>::new<(),closure-0>(std::ffi::c_str::CStr * title=0x0000021e69c27f50, int url, int width, bool height=600, bool resizable=true, ..., dialog::main::closure-0 debug=true) Line 290
at C:\Users\samgr\src\web-view-rs\src\lib.rs(290)
dialog.exe!web_view::WebViewBuilder<(), closure-0, str*>::build<(),closure-0,str*>(web_view::WebViewBuilder<(), closure-0, str*> self) Line 214
at C:\Users\samgr\src\web-view-rs\src\lib.rs(214)
dialog.exe!dialog::main() Line 8
at C:\Users\samgr\src\web-view-rs\examples\dialog.rs(8)
```

[Minidump](https://github.com/Boscop/web-view/files/3669120/dialog-dmp.zip)