Remove LanguageCode

Because the official Telegram documentation doesn't specify a concrete version of IETF language tag.

src/types/non_telegram_types/language_code.rs

@@ -1,193 +0,0 @@
-use serde::{Deserialize, Serialize};
-
-#[derive(Copy, Clone, Debug, Eq, Hash, PartialEq, Serialize, Deserialize)]
-#[serde(rename_all = "lowercase")]
-pub enum LanguageCode {
-    AA,
-    AB,
-    AE,
-    AF,
-    AK,
-    AM,
-    AN,
-    AR,
-    AS,
-    AV,
-    AY,
-    AZ,
-    BA,
-    BE,
-    BG,
-    BH,
-    BI,
-    BM,
-    BN,
-    BO,
-    BR,
-    BS,
-    CA,
-    CE,
-    CH,
-    CO,
-    CR,
-    CS,
-    CU,
-    CV,
-    CY,
-    DA,
-    DE,
-    DV,
-    DZ,
-    EE,
-    EL,
-    EN,
-    EO,
-    ES,
-    ET,
-    EU,
-    FA,
-    FF,
-    FI,
-    FJ,
-    FO,
-    FR,
-    FY,
-    GA,
-    GD,
-    GL,
-    GN,
-    GU,
-    GV,
-    HA,
-    HE,
-    HI,
-    HO,
-    HR,
-    HT,
-    HU,
-    HY,
-    HZ,
-    IA,
-    ID,
-    IE,
-    IG,
-    II,
-    IK,
-    IO,
-    IS,
-    IT,
-    IU,
-    JA,
-    JV,
-    KA,
-    KG,
-    KI,
-    KJ,
-    KK,
-    KL,
-    KM,
-    KN,
-    KO,
-    KR,
-    KS,
-    KU,
-    KV,
-    KW,
-    KY,
-    LA,
-    LB,
-    LG,
-    LI,
-    LN,
-    LO,
-    LT,
-    LU,
-    LV,
-    MG,
-    MH,
-    MI,
-    MK,
-    ML,
-    MN,
-    MR,
-    MS,
-    MT,
-    MY,
-    NA,
-    NB,
-    ND,
-    NE,
-    NG,
-    NL,
-    NN,
-    NO,
-    NR,
-    NV,
-    NY,
-    OC,
-    OJ,
-    OM,
-    OR,
-    OS,
-    PA,
-    PI,
-    PL,
-    PS,
-    PT,
-    QU,
-    RM,
-    RN,
-    RO,
-    RU,
-    RW,
-    SA,
-    SC,
-    SD,
-    SE,
-    SG,
-    SI,
-    SK,
-    SL,
-    SM,
-    SN,
-    SO,
-    SQ,
-    SR,
-    SS,
-    ST,
-    SU,
-    SV,
-    SW,
-    TA,
-    TE,
-    TG,
-    TH,
-    TI,
-    TK,
-    TL,
-    TN,
-    TO,
-    TR,
-    TS,
-    TT,
-    TW,
-    TY,
-    UG,
-    UK,
-    UR,
-    UZ,
-    VE,
-    VI,
-    VO,
-    WA,
-    WO,
-    XH,
-    YI,
-    YO,
-    ZA,
-    ZH,
-    ZU,
-
-    #[serde(other)]
-    Other,
-}

src/types/non_telegram_types/mod.rs

@@ -1,9 +1,7 @@
 pub use country_code::*;
 pub use currency::*;
-pub use language_code::*;
 pub use mime_wrapper::*;
 
 mod country_code;
 mod currency;
-mod language_code;
 mod mime_wrapper;

src/types/user.rs

@@ -1,4 +1,3 @@
-use crate::types::LanguageCode;
 use serde::{Deserialize, Serialize};
 
 /// This object represents a Telegram user or bot.
@@ -25,7 +24,7 @@ pub struct User {
     /// [IETF language tag] of the user's language.
     ///
     /// [IETF language tag]: https://en.wikipedia.org/wiki/IETF_language_tag
-    pub language_code: Option<LanguageCode>,
+    pub language_code: Option<String>,
 }
 
 impl User {

src/utils/command.rs

@@ -134,7 +134,7 @@ where
 ///
 /// `prefix`: symbols, which denote start of a command.
 ///
-/// Example:
+/// ## Example
 /// ```
 /// use teloxide::utils::command::parse_command_with_prefix;
 ///