change indentation in README from tabs to spaces

Author: Fytch

README.md

@@ -321,47 +321,47 @@ We may bind options to variables of type `std::string`, to 32- or 64-bit signed
 #include <string_view>
 
 int main( int argc, char** argv ) {
-	po::parser parser;
-
-	std::uint32_t optimization = 0;	// the value we set here acts as an implicit fallback
-	parser[ "optimization" ]
-		.abbreviation( 'O' )
-		.description( "set the optimization level (default: -O0)" )
-		.bind( optimization );		// write the parsed value to the variable 'optimization'
-									// .bind( optimization ) automatically calls .type( po::u32 ) and .single()
-
-	std::vector< std::string > include_paths;
-	parser[ "include-path" ]
-		.abbreviation( 'I' )
-		.description( "add an include path" )
-		.bind( include_paths );		// append paths to the vector 'include_paths'
-
-	parser[ "help" ]
-		.abbreviation( '?' )
-		.description( "print this help screen" );
-
-	std::deque< std::string > files;
-	parser[ "" ]
-		.bind( files );				// append paths to the deque 'include_paths
-
-	if( !parser( argc, argv ) )
-		return -1;
-
-	// we don't want to print anything else if the help screen has been displayed
-	if( parser[ "help" ].was_set() ) {
-		std::cout << parser << '\n';
-		return 0;
-	}
-
-	// print the parsed values
-	// note that we don't need to access parser anymore; all data is stored in the bound variables
-	std::cout << "optimization level = " << optimization << '\n';
-	std::cout << "include files (" << files.size() << "):\n";
-	for( auto&& i : files )
-		std::cout << '\t' << i << '\n';
-	std::cout << "include paths (" << include_paths.size() << "):\n";
-	for( auto&& i : include_paths )
-		std::cout << '\t' << i << '\n';
+    po::parser parser;
+
+    std::uint32_t optimization = 0; // the value we set here acts as an implicit fallback
+    parser[ "optimization" ]
+        .abbreviation( 'O' )
+        .description( "set the optimization level (default: -O0)" )
+        .bind( optimization );      // write the parsed value to the variable 'optimization'
+                                    // .bind( optimization ) automatically calls .type( po::u32 ) and .single()
+
+    std::vector< std::string > include_paths;
+    parser[ "include-path" ]
+        .abbreviation( 'I' )
+        .description( "add an include path" )
+        .bind( include_paths );     // append paths to the vector 'include_paths'
+
+    parser[ "help" ]
+        .abbreviation( '?' )
+        .description( "print this help screen" );
+
+    std::deque< std::string > files;
+    parser[ "" ]
+        .bind( files );             // append paths to the deque 'include_paths
+
+    if( !parser( argc, argv ) )
+        return -1;
+
+    // we don't want to print anything else if the help screen has been displayed
+    if( parser[ "help" ].was_set() ) {
+        std::cout << parser << '\n';
+        return 0;
+    }
+
+    // print the parsed values
+    // note that we don't need to access parser anymore; all data is stored in the bound variables
+    std::cout << "optimization level = " << optimization << '\n';
+    std::cout << "include files (" << files.size() << "):\n";
+    for( auto&& i : files )
+        std::cout << '\t' << i << '\n';
+    std::cout << "include paths (" << include_paths.size() << "):\n";
+    for( auto&& i : include_paths )
+        std::cout << '\t' << i << '\n';
 }
 ```