Added Venue; #[skip_serizlizing_if = "Option::is_none"] where it is missed

src/core/types/answer_pre_checkout_query.rs

@@ -2,5 +2,6 @@
 pub struct AnswerPreCheckoutQuery {
     pub pre_checkout_query_id: String,
     pub ok: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub error_message: Option<String>,
 }

src/core/types/answer_shipping_query.rs

@@ -4,6 +4,8 @@ use crate::core::types::ShippingOption;
 pub struct AnswerShippingQuery {
     pub shipping_query_id: String,
     pub ok: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub shipping_options: Option<Vec<ShippingOption>>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub error_message: Option<String>,
 }

src/core/types/audio.rs

@@ -5,9 +5,14 @@ use crate::core::types::PhotoSize;
 pub struct Audio {
     pub file_id: String,
     pub duration: u32,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub performer: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub title: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub mime_type: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub file_size: Option<u32>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub thumb: Option<PhotoSize>
 }

src/core/types/login_url.rs

@@ -1,7 +1,10 @@
 #[derive(Debug, Deserialize, Hash, PartialEq, Eq)]
 pub struct LoginUrl {
     url: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
     forward_text: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     bot_username: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     request_write_access: Option<bool>,
 }

src/core/types/venue.rs

@@ -0,0 +1,13 @@
+use crate::core::types::Location;
+
+
+#[derive(Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
+pub struct Venue {
+    pub location: Location,
+    pub title: String,
+    pub address: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub foursquare_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub foursquare_type: Option<String>
+}