Fix docs typo, bump version for bugfix release v0.3.1

Author: saxbophone

CMakeLists.txt

@@ -9,7 +9,7 @@ else()
     set(ARBY_SUBPROJECT ON)
 endif()
 
-project(arby VERSION 0.3.0 LANGUAGES CXX)
+project(arby VERSION 0.3.1 LANGUAGES CXX)
 
 find_program(CCACHE_PROGRAM ccache)
 if(CCACHE_PROGRAM)

arby/include/arby/Nat.hpp

@@ -498,7 +498,7 @@ namespace com::saxbophone::arby {
         /**
          * @brief division and modulo all-in-one, equivalent to C/C++ div() and Python divmod()
          * @param lhs,rhs operands for the division/modulo operation
-         * @returns tuple of {quotient, remainder}
+         * @returns pair of {quotient, remainder}
          * @throws std::domain_error when rhs is zero
          */
         static constexpr std::pair<Nat, Nat> divmod(const Nat& lhs, const Nat& rhs) {