update 'anyconfig_cli --help' output and add an example of ignore_mis…

…sing use case in REAMDE

README.rst

@@ -113,12 +113,16 @@ To load multiple config files::
   # Specify config files by list of paths:
   data1 = anyconfig.load(["/etc/foo.d/a.json", "/etc/foo.d/b.json"])
 
+  # Similar to the above but all or one of config files are missing:
+  data2 = anyconfig.load(["/etc/foo.d/a.json", "/etc/foo.d/b.json"],
+                         ignore_missing=True)
+
   # Specify config files by glob path pattern:
-  data2 = anyconfig.load("/etc/foo.d/*.json")
+  data3 = anyconfig.load("/etc/foo.d/*.json")
 
-  # Similar to above, but parameters in the former config file will be simply
+  # Similar to the above, but parameters in the former config file will be simply
   # overwritten by the later ones:
-  data3 = anyconfig.load("/etc/foo.d/*.json", merge=anyconfig.MS_REPLACE)
+  data4 = anyconfig.load("/etc/foo.d/*.json", merge=anyconfig.MS_REPLACE)
 
 On loading multiple config files, you can choose 'strategy' to merge
 configurations from the followings:
@@ -208,51 +212,58 @@ There is a CLI frontend 'anyconfig_cli' to demonstrate the power of this library
 
 It can process various config files and output a merged config file::
 
-  $ anyconfig_cli -h
+  ssato@localhost% anyconfig_cli -h
   Usage: anyconfig_cli [Options...] CONF_PATH_OR_PATTERN_0 [CONF_PATH_OR_PATTERN_1 ..]
 
   Examples:
     anyconfig_cli --list
-    anyconfig_cli -I yaml /etc/xyz/conf.d/a.conf
+    anyconfig_cli -I yaml -O yaml /etc/xyz/conf.d/a.conf
     anyconfig_cli -I yaml '/etc/xyz/conf.d/*.conf' -o xyz.conf --otype json
     anyconfig_cli '/etc/xyz/conf.d/*.json' -o xyz.yml \
       --atype json -A '{"obsoletes": "sysdata", "conflicts": "sysdata-old"}'
     anyconfig_cli '/etc/xyz/conf.d/*.json' -o xyz.yml \
       -A obsoletes:sysdata;conflicts:sysdata-old
     anyconfig_cli /etc/foo.json /etc/foo/conf.d/x.json /etc/foo/conf.d/y.json
     anyconfig_cli '/etc/foo.d/*.json' -M noreplace
+    anyconfig_cli '/etc/foo.d/*.json' --get a.b.c
+    anyconfig_cli '/etc/foo.d/*.json' --set a.b.c=1
 
   Options:
+    --version             show program's version number and exit
     -h, --help            show this help message and exit
     -L, --list            List supported config types
     -o OUTPUT, --output=OUTPUT
                           Output file path
     -I ITYPE, --itype=ITYPE
-                          Select type of Input config files from ini, json,
-                          yaml, xml [Automatically detected by file ext]
+                          Select type of Input config files from ini, json, xml,
+                          yaml [Automatically detected by file ext]
     -O OTYPE, --otype=OTYPE
                           Select type of Output config files from ini, json,
-                          yaml, xml [Automatically detected by file ext]
+                          xml, yaml [Automatically detected by file ext]
     -M MERGE, --merge=MERGE
                           Select strategy to merge multiple configs from
-                          noreplace, merge_dicts_and_lists, merge_dicts, replace
+                          replace, noreplace, merge_dicts, merge_dicts_and_lists
                           [merge_dicts]
     -A ARGS, --args=ARGS  Argument configs to override
-    --atype=ATYPE         Explicitly select type of argument config from ini,
-                          json, yaml, xml. If this option is not set, original
-                          parser is used:  'K:V' will become {K: V},
+    --atype=ATYPE         Explicitly select type of argument to provide configs
+                          from ini, json, xml, yaml.  If this option is not set,
+                          original parser is used: 'K:V' will become {K: V},
                           'K:V_0,V_1,..' will become {K: [V_0, V_1, ...]}, and
                           'K_0:V_0;K_1:V_1' will become {K_0: V_0, K_1: V_1}
                           (where the tyep of K is str, type of V is one of Int,
                           str, etc.
-    --get=GET             Specify key path to get part of config, for example,
-                          if a config {'a': {'b': {'c': 0, 'd': 1}}} '--get
-                          a.b.c' gives 0 and '--get a.b' gives {'c': 0, 'd': 1}.
+    --get=GET             Specify key path to get part of config, for example, '
+                          --get a.b.c' to config {'a': {'b': {'c': 0, 'd': 1}}}
+                          gives 0 and '--get a.b' to the same config gives {'c':
+                          0, 'd': 1}.
+    --set=SET             Specify key path to set (update) part of config, for
+                          example, '--set a.b.c=1' to a config {'a': {'b': {'c':
+                          0, 'd': 1}}} gives {'a': {'b': {'c': 1, 'd': 1}}}.
+    -x, --ignore-missing  Ignore missing input files
     -s, --silent          Silent or quiet mode
     -q, --quiet           Same as --silent option
     -v, --verbose         Verbose mode
-  $
-
+  ssato@localhost%
 
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