Rename `LuaString::get` to `to_str`

This is what similar types in libstd do (`CStr::to_str`,
`OsStr::to_str`, `Path::to_str`).

src/conversion.rs

@@ -143,7 +143,7 @@ impl<'lua> ToLua<'lua> for String {
 
 impl<'lua> FromLua<'lua> for String {
     fn from_lua(value: LuaValue<'lua>, lua: &'lua Lua) -> LuaResult<Self> {
-        Ok(lua.coerce_string(value)?.get()?.to_owned())
+        Ok(lua.coerce_string(value)?.to_str()?.to_owned())
     }
 }
 

src/lua.rs

@@ -168,7 +168,7 @@ pub struct LuaString<'lua>(LuaRef<'lua>);
 
 impl<'lua> LuaString<'lua> {
     /// Get a `&str` slice if the Lua string is valid UTF-8.
-    pub fn get(&self) -> LuaResult<&str> {
+    pub fn to_str(&self) -> LuaResult<&str> {
         let lua = self.0.lua;
         unsafe {
             stack_guard(lua.state, 0, || {

src/tests.rs

@@ -269,7 +269,7 @@ fn test_metamethods() {
             });
             methods.add_meta_method(LuaMetaMethod::Index, |lua, data, args| {
                 let index = lua.unpack::<LuaString>(args)?;
-                if index.get()? == "inner" {
+                if index.to_str()? == "inner" {
                     lua.pack(data.0)
                 } else {
                     Err("no such custom index".into())