Suggest sharper chmod on install guide

Author: felipecrs

README.md

@@ -66,9 +66,9 @@ ARG DOCKER_PATH="/usr/local/bin/docker"
 RUN mv -f "${DOCKER_PATH}" "${DOCKER_PATH}.orig"
 
 # Install dond-shim at the same path as the original docker cli
-ARG DOND_SHIM_VERSION="0.6.0"
+ARG DOND_SHIM_VERSION="0.6.1"
 ADD "https://github.com/felipecrs/docker-on-docker-shim/raw/v${DOND_SHIM_VERSION}/dond" "${DOCKER_PATH}"
-RUN chmod +x "${DOCKER_PATH}"
+RUN chmod 755 "${DOCKER_PATH}"
 ```
 
 ### As `dond`
@@ -82,8 +82,8 @@ FROM docker:latest
 RUN apk add --no-cache bash
 
 # Install dond-shim to /usr/local/bin/dond
-ARG DOND_SHIM_VERSION="0.6.0"
+ARG DOND_SHIM_VERSION="0.6.1"
 ARG DOND_SHIM_PATH="/usr/local/bin/dond"
 ADD "https://github.com/felipecrs/docker-on-docker-shim/raw/v${DOND_SHIM_VERSION}/dond" "${DOND_SHIM_PATH}"
-RUN chmod +x "${DOND_SHIM_PATH}"
+RUN chmod 755 "${DOND_SHIM_PATH}"
 ```