chore: remove trailing whitespace in README.md

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/chisquare/mean/README.md

@@ -191,7 +191,7 @@ int main( void ) {
     double k;
     double y;
     int i;
-    
+
     for ( i = 0; i < 25; i++ ) {
         k = random_uniform( 0.0, 20.0 );
         y = stdlib_base_dists_chisquare_mean( k );