No logging colours if writing to file

[mbhall88]

If the log is being redirected to a file, it would be nice to disable colouring, otherwise the log file looks like thi

ESC[32m[INFO  vcfdist 09:35:06]ESC[0m ESC[35m[0/8] Loading reference FASTAESC[0m '/data/scratch/projects/punim2009/NanoVarBench/results/truth/ATCC_25922__202309/mutreference.fna'
ESC[32m[INFO  vcfdist 09:35:06]ESC[0m
ESC[32m[INFO  vcfdist 09:35:06]ESC[0m ESC[35m[Q 0/8] Parsing QUERY VCFESC[0m '/data/scratch/projects/punim2009/NanoVarBench/results/call/mutref/clair3/100x/simplex/v4.3.0/dna_r10.4.1_e8.2_400bps_fast@v4.3.0/ATCC_25922__202309.100x.clair3.filter.vcf.gz'
ESC[33m[WARN  vcfdist 09:35:06]ESC[0m 'PS' tag not defined in QUERY VCF header, assuming one phase set per contig
ESC[32m[INFO  vcfdist 09:35:06]ESC[0m   Genotypes:
ESC[32m[INFO  vcfdist 09:35:06]ESC[0m       1: 8762

[TimD1]

Fixed in vcfdist v2.3.4