Rename HEL -> HELLO

src/hello/hello.d

@@ -125,7 +125,7 @@ extern (C) EFI_STATUS efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * st)
 
     st.ConOut.ClearScreen(st.ConOut);
 
-    writeln("HOS EFI loader");
+    writeln("HELLO, HOS EFI Lightweight LOader, v0.1.0");
     writeln("Firmware vendor: '%S', version: 0x%x", st.FirmwareVendor, st.FirmwareVendor);
 
     if (!set_graphics_mode())

src/hello/output.d

@@ -1,5 +1,5 @@
 import uefi;
-import hel;
+import hello;
 import core.stdc.stdarg;
 
 private size_t format_hex(CHAR16 * s, ulong v, bool ptr)