Restrict SlackHeaderBlock to accept plan text only block (#273)

* Restrict SlackHeaderBlock to accept plan text only block

* Fix new cargo clippy warnings

src/api/files.rs

@@ -87,10 +87,7 @@ pub struct SlackApiFilesUploadResponse {
     pub file: SlackFile,
 }
 
-fn to_csv<S: Serializer>(x: &Option<Vec<SlackChannelId>>, s: S) -> Result<S::Ok, S::Error>
-where
-    S: Serializer,
-{
+fn to_csv<S: Serializer>(x: &Option<Vec<SlackChannelId>>, s: S) -> Result<S::Ok, S::Error> {
     match x {
         None => s.serialize_none(),
         Some(ids) => {

src/models/blocks/datetime.rs

@@ -13,6 +13,7 @@ pub enum SlackDateTimeFormats {
     TimeSecs,
 }
 
+#[allow(clippy::to_string_trait_impl)]
 impl ToString for SlackDateTimeFormats {
     fn to_string(&self) -> String {
         match self {

src/models/blocks/kit.rs

@@ -56,7 +56,7 @@ impl From<SlackSectionBlock> for SlackBlock {
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize, Builder)]
 pub struct SlackHeaderBlock {
     pub block_id: Option<SlackBlockId>,
-    pub text: SlackBlockText,
+    pub text: SlackBlockPlainTextOnly,
 }
 
 impl From<SlackHeaderBlock> for SlackBlock {
@@ -874,8 +874,8 @@ impl From<SlackBlockCheckboxesElement> for SlackActionBlockElement {
 }
 
 /**
-* 'plain_text' type of https://api.slack.com/reference/block-kit/composition-objects#text
-*/
+ * 'plain_text' type of https://api.slack.com/reference/block-kit/composition-objects#text
+ */
 #[skip_serializing_none]
 #[derive(Debug, PartialEq, Clone, Serialize, Deserialize, Builder)]
 pub struct SlackBlockPlainText {

src/models/common/mod.rs

@@ -9,23 +9,35 @@ use std::*;
 use url::Url;
 
 mod user;
+
 pub use user::*;
+
 mod team;
+
 pub use team::*;
+
 mod channel;
+
 pub use channel::*;
+
 mod reaction;
+
 pub use reaction::*;
+
 mod star;
+
 pub use star::*;
 
 mod bot;
+
 pub use bot::*;
 
 mod icon;
+
 pub use icon::*;
 
 mod formatters;
+
 pub use formatters::*;
 
 #[derive(Debug, Eq, PartialEq, Hash, Clone, Serialize, Deserialize, ValueStruct)]
@@ -178,6 +190,7 @@ pub enum SlackConversationType {
     Public,
 }
 
+#[allow(clippy::to_string_trait_impl)]
 impl ToString for SlackConversationType {
     fn to_string(&self) -> String {
         match self {

src/socket_mode/wss_client_id.rs

@@ -24,6 +24,7 @@ impl SlackSocketModeWssClientId {
     }
 }
 
+#[allow(clippy::to_string_trait_impl)]
 impl ToString for SlackSocketModeWssClientId {
     fn to_string(&self) -> String {
         format!(

src/token.rs

@@ -24,6 +24,7 @@ pub enum SlackApiTokenType {
     App,
 }
 
+#[allow(clippy::to_string_trait_impl)]
 impl ToString for SlackApiTokenType {
     fn to_string(&self) -> String {
         match self {