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Update Travis CI configuration to use `curl -fsS` instead of `eval "$… #222

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1 error and 10 warnings

Process completed with exit code 8.

conversion to 'size_t' {aka 'long unsigned int'} from 'int' may change the sign of the result [-Wsign-conversion]

use of old-style cast to 'mpfr_uexp_t' {aka 'long unsigned int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_exp_t' {aka 'long int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_uexp_t' {aka 'long unsigned int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_exp_t' {aka 'long int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_uexp_t' {aka 'long unsigned int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_exp_t' {aka 'long int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_uexp_t' {aka 'long unsigned int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_exp_t' {aka 'long int'} [-Wold-style-cast]

use of old-style cast to 'mpfr_srcptr' {aka 'const struct __mpfr_struct*'} [-Wold-style-cast]