bc and codespell are optional

dev/hooks/pre-commit.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-#### $$VERSION$$ v1.2-pre2-0-ga1773cc
+#### $$VERSION$$ v1.2-pre2-1-gb5caff0
 
 ############
 # NOTE: you MUST run install-hooks.sh again when updating this file!
@@ -49,7 +49,7 @@ VERSION="$(git describe --tags | sed -e 's/-.*//' -e 's/v//' -e 's/,/./')"
 
 # LOCAL version must greater than latest REMOTE release version
 echo "Update Version of modified files" 
-if (( $(echo "${VERSION} >= ${REMOTEVER}" | bc -l) )); then
+if ! command -v bc &> /dev/null || (( $(echo "${VERSION} >= ${REMOTEVER}" | bc -l) )); then
 	# update version in bashbot files on push
 	set +f
 	[ -f "${LASTPUSH}" ] && LASTFILES="$(find ./* -newer "${LASTPUSH}")"

doc/7_develop.md

@@ -190,7 +190,7 @@ Now have a look at the directory 'standalone', here you find the files 'bashbot.
 
 ### Setup your develop environment
 
-1. install git, install [shellcheck](5_practice.md#Test-your-Bot-with-shellcheck), install pandoc
+1. install the commands git, [shellcheck](5_practice.md#Test-your-Bot-with-shellcheck), bc, pandoc, bc, codespell
 2. setup your [environment for UTF-8](4_expert.md#Setting-up-your-Environment)
 3. clone your bashbot fork to a new directory ```git clone https://github.com/<YOURNAME>/telegram-bot-bash.git```, replace ```<YOURNAME>``` with your username on github
 4. create and change to your develop branch ```git checkout -b <YOURBRANCH>```, replace ```<YOURBRANCH>``` with the name you want to name it, e.g. 'develop'
@@ -349,5 +349,5 @@ fi
 
 #### [Prev Function Reference](6_reference.md)
 
-#### $$VERSION$$ v1.2-pre2-0-ga1773cc
+#### $$VERSION$$ v1.2-pre2-1-gb5caff0