Format sample usage

README.md

@@ -23,37 +23,35 @@ Features:
 - two variants, one depends on Boost Lockfree Queue library, http://boost.org, which is a header only library
 
 
-Sample usage
+Sample usage:
 
-<code>void first(int id) {
+```cpp
+void first(int id) {
     std::cout << "hello from " << id << '\n';
-}</code>
+}
 
-<code>&#32;&#32;struct Second {
+struct Second {
     void operator()(int id) const {
         std::cout << "hello from " << id << '\n';
     }
 } second;
 
-<code>void third(int id, const std::string & additional_param) {}</code>
+void third(int id, const std::string & additional_param) {}
 
+int main () {
+    ctpl::thread_pool p(2 /* two threads in the pool */);
+    p.push(first);  // function
 
-<code>int main () {</code>
+    p.push(third, "additional_param");
 
-<code>&#32;&#32;&#32;&#32;ctpl::thread_pool p(2 /* two threads in the pool */);</code>
-
-<code>&#32;&#32;&#32;&#32;p.push(first);  // function</code>
-
-<code>&#32;&#32;&#32;&#32;p.push(third, "additional_param");</code>
-
-<code>&#32;&#32;&#32;&#32;p.push( &#91;&#93; (int id){
-  std::cout << "hello from " << id << '\n';
-});  // lambda</code>
-
-<code>&#32;&#32;&#32;&#32;p.push(std::ref(second));  // functor, reference</code>
-
-<code>&#32;&#32;&#32;&#32;p.push(const_cast&#60;const Second &&#62;(second));  // functor, copy ctor</code>
-
-<code>&#32;&#32;&#32;&#32;p.push(std::move(second));  // functor, move ctor</code>
-
-<code>}</code>
+    p.push([] (int id) {
+        std::cout << "hello from " << id << '\n';
+    });  // lambda
+
+    p.push(std::ref(second));  // functor, reference
+
+    p.push(const_cast<const Second &>(second));  // functor, copy ctor
+
+    p.push(std::move(second));  // functor, move ctor
+}
+```