put mishmash in codedweller namespace

mishmash.cpp

 
 #include "mishmash.hpp"
 
-namespace mishmash {
+namespace codedweller {
 
     uint32_t primes[256] {
         1019,   1021,   1031,   1033,   1039,   1049,   1051,   1061,

mishmash.hpp

 #include <string>
 #include <vector>
 
-namespace mishmash {
+namespace codedweller {
 
     uint32_t hash(const unsigned char* buffer, size_t length) noexcept;
     uint32_t hash(const std::string &s) noexcept;