add Send+Sync as Formatter supertrait

Author: MaxVerevkin

src/formatting/formatter.rs

@@ -61,15 +61,15 @@ enum EngFixArgs {
     Prefix,
 }
 
-pub trait Formatter: Debug {
+pub trait Formatter: Debug + Send + Sync {
     fn format(&self, val: &Value) -> Result<String>;
 
     fn interval(&self) -> Option<Duration> {
         None
     }
 }
 
-pub fn new_formatter(name: &str, args: &[String]) -> Result<Box<dyn Formatter + Send + Sync>> {
+pub fn new_formatter(name: &str, args: &[String]) -> Result<Box<dyn Formatter>> {
     match name {
         "str" => {
             let min_width: usize = match args.get(StrArgs::MinWidth as usize) {

src/formatting/template.rs

@@ -21,7 +21,7 @@ pub enum Token {
     Recursive(FormatTemplate),
     Var {
         name: String,
-        formatter: Option<Box<dyn Formatter + Send + Sync>>,
+        formatter: Option<Box<dyn Formatter>>,
     },
 }