Added minimum requested version of Carp to Makefile.pl

Carp >= 1.25 is required, because t/undef-params.t failing with older versions

t/undef-params.t ...................................................... 1/? 
#   Failed test at t/undef-params.t line 36.
#          got: 'You called ->params with an undefined value at t/undef-params.t line 20
# '
#     expected: 'You called ->params with an undefined value at t/undef-params.t line 20.
# '
# Looks like you failed 1 test of 5.