fix collectstats contianer

Snakefile

@@ -588,7 +588,7 @@ rule fastqc_stats:
         postqc_r1="{sample}/pre_process/postqc_fastqc/{sample}.cutadapt_R1_fastqc.zip",
         postqc_r2="{sample}/pre_process/postqc_fastqc/{sample}.cutadapt_R2_fastqc.zip",
         sc=fqpy
-    singularity: "docker://quay.io/biocontainers/vtools:1.0.0--py37h3010b51_0"
+    singularity: "docker://python:3.6-slim"
     conda: "envs/collectstats.yml"
     output:
         "{sample}/pre_process/fastq_stats.json"
@@ -664,7 +664,7 @@ if len(BASE_BEDS) >= 1:
             fthresh=FEMALE_THRESHOLD
         output:
             "{sample}/{sample}.stats.json"
-        singularity: "docker://python:3.6-slim"
+        singularity: "docker://quay.io/biocontainers/vtools:1.0.0--py37h3010b51_0"
         conda: "envs/collectstats.yml"
         shell: "python {input.colpy} --sample-name {params.sample_name} "
                "--pre-qc-fastq {input.preqc} --post-qc-fastq {input.postq} "
@@ -689,7 +689,7 @@ else:
             fthresh = FEMALE_THRESHOLD
         output:
             "{sample}/{sample}.stats.json"
-        singularity: "docker://python:3.6-slim"
+        singularity: "docker://quay.io/biocontainers/vtools:1.0.0--py37h3010b51_0"
         conda: "envs/collectstats.yml"
         shell: "python {input.colpy} --sample-name {params.sample_name} "
                "--pre-qc-fastq {input.preqc} --post-qc-fastq {input.postq} "