Changed readme

Author: qzb

README.md

@@ -1,21 +1,27 @@
-sh-semver
-=========
-
+# sh-semver
 [![Build Status](https://travis-ci.org/jsokolowski/sh-semver.svg?branch=master)](https://travis-ci.org/jsokolowski/sh-semver)
 
-Pure sh implementation of semantic versioning
-
-Range matching
---------------
-
-Every range contains one or more sets of rules. To satisfy range version must satisfies all rules from at least one set. Sets are separated with two vertical bars (__||__). Rules in each set are separated with whitespaces. Empty set are treated as wildcard rule (__\*__);
+The semantic versioner for Bourne Shell.
 
-### Basic rules
+## Ranges
 
-There is four basic rules: __>__, __<=__, __<__, __>=__. All other rules are translated to groups of these ones.
+Every *version range* contains one or more *sets of comparators*. To satisfy *version range* version must satisfies all *comparators* from at least one set. Sets are separated with two vertical bars ``||``. Rules in each set are separated with whitespaces. Empty set are treated as wildcard comparator ``*``.
 
-First two (__>__ and __<=__) are rather simple. For example _>1.2.3_ is satisfied by _1.2.4_ version but not by _1.2.3_ and _<=1.2.3_ is satisfied by _1.2.3-beta_ but not by _1.2.4_. Second two (__<__ and __>=__) are little bit trickier. Literally version _2.0.0-beta_ should match to rule _<2.0.0_ but it is something you probably don't want to, so rule _<2.0.0_ is converted to _<2.0.0-0_. In case of rule __>=__ the oposite is true, version _2.0.0-beta_ should satisfy rule _>=2.0.0_ so this rule is converted to _>=2.0.0-0_. This behavior can be changed by specifying a prerelase. For example rule _<2.0.0-beta_ will be not satisfied by _2.0.0-alpha_.
+### Basic comparators
+There are five basic comparators:
 
-You doesn't have to specify full version number in rule, altough rules like _>1.2.0_ and _>1.2_ are not the same. For example the lowest version witch satisfies rule _>1.2_ is not a _1.2.1-0_ but _1.3.0-0_. So length of version number in rule affects precision of comparison.
+* Equal to ``=A.B.C`` (``=`` operator is optional, it may be provided but usually it isn't).
+* Less than ``<A.B.C``
+* Greater than ``>A.B.C``
+* Less than or equal to ``<=A.B.C``
+* Greater than or equal to ``>=A.B.C``
 
+### Advanced comparators
+##### Wildcard ``*`` ``*.*`` ``*.*.*``
+##### Wildcard ranges ``A.*.*`` ``A.B.*``
+##### Caret with ``^A.B.C`` ``^A.B`` ``^A``
+##### Tilde ranges ``~A.B.C`` ``~A.B`` ``~A``
+##### Hyphen ranges ``A.B.C - X.Y.Z``
 
+### Prerelease versions
+Prerelease versions can satisfy comparators set only when have the same minor major and patch numbers as at least one of comparators.