Update Makefile.manual

Author: Jim-215-Fisher

src/Makefile.manual

@@ -16,7 +16,7 @@ SRC = f18estop.f90 \
       stdlib_stats_mean.f90 \
       stdlib_stats_moment.f90 \
       stdlib_stats_var.f90 \
-      stdlib_stats_distribution_PRNG.f90\
+      stdlib_stats_distribution_PRNG.f90 \
       stdlib_stats_distribution_uniform.f90 \
       stdlib_stats_distribution_normal.f90 \
       stdlib_stats_distribution_exponential.f90